An encyclopedia (also spelled encyclopaedia or encyclopædia) is a type of reference work – a compendium holding a summary of information from either all branches of knowledge or a particular branch of knowledge. Encyclopedias are divided into articles or entries, which are usually accessed alphabetically by article name. Encyclopedia entries are longer and more detailed than those in most dictionaries. Generally speaking, unlike dictionary entries, which focus on linguistic information about words, encyclopedia articles focus on factual information to cover the thing or concept for which the article name stands.
Encyclopedias have existed for around 2,000 years; the oldest still in existence, Naturalis Historia, was written in ca. AD 77 by Pliny the Elder. The modern encyclopedia evolved out of dictionaries around the 17th century. Historically, some encyclopedias were contained in one volume, but some, such as the Encyclopædia Britannica or the world's largest Enciclopedia universal ilustrada europeo-americana, became huge multi-volume works. Some modern encyclopedias, such as Wikipedia, are electronic and are often freely available.
The word encyclopaedia comes from the Koine Greek ἐγκυκλοπαιδεία, from Greek ἐγκύκλιος παιδεία, and is transliterated enkyklios paideia, meaning "general education": enkyklios (ἐγκύκλιος), meaning "circular, recurrent, required regularly, general" + paideia (παιδεία), meaning "education, rearing of a child", but it was reduced to a single word due to an error by copyists of Latin manuscripts. Together, the phrase literally translates as "complete instruction" or "complete knowledge".
Indeed, the purpose of an encyclopedia is to collect knowledge disseminated around the globe; to set forth its general system to the men with whom we live, and transmit it to those who will come after us, so that the work of preceding centuries will not become useless to the centuries to come; and so that our offspring, becoming better instructed, will at the same time become more virtuous and happy, and that we should not die without having rendered a service to the human race in the future years to come.
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The modern encyclopedia was developed from the dictionary in the 18th century. Historically, both encyclopedias and dictionaries have been researched and written by well-educated, well-informed content experts, but they are significantly different in structure. A dictionary is a linguistic work which primarily focuses on alphabetical listing of words and their definitions. Synonymous words and those related by the subject matter are to be found scattered around the dictionary, giving no obvious place for in-depth treatment. Thus, a dictionary typically provides limited information, analysis or background for the word defined. While it may offer a definition, it may leave the reader lacking in understanding the meaning, significance or limitations of a term, and how the term relates to a broader field of knowledge. An encyclopedia is, allegedly, not written in order to convince, although one of its goals is indeed to convince its reader about its own veracity. In the terms of Aristotle's Modes of persuasion, a dictionary should persuade the reader through logos (conveying only appropriate emotions); it will be expected to have a lack of pathos (it should not stir up irrelevant emotions), and to have little ethos except that of the dictionary itself.
To address those needs, an encyclopedia article is typically non linguistic, and covers not a word, but a subject or discipline. As well as defining and listing synonymous terms for the topic, the article is able to treat it in more depth and convey the most relevant accumulated knowledge on that subject. An encyclopedia article also often includes many maps and illustrations, as well as bibliography and statistics.
Four major elements define an encyclopedia: its subject matter, its scope, its method of organization, and its method of production:
- Encyclopedias can be general, containing articles on topics in every field (the English-language Encyclopædia Britannica and German Brockhaus are well-known examples). General encyclopedias often contain guides on how to do a variety of things, as well as embedded dictionaries and gazetteers. There are also encyclopedias that cover a wide variety of topics but from a particular cultural, ethnic, or national perspective, such as the Great Soviet Encyclopedia or Encyclopaedia Judaica.
- Works of encyclopedic scope aim to convey the important accumulated knowledge for their subject domain, such as an encyclopedia of medicine, philosophy, or law. Works vary in the breadth of material and the depth of discussion, depending on the target audience. (For example, the Medical encyclopedia produced by A.D.A.M., Inc. for the U.S. National Institutes of Health.)
- Some systematic method of organization is essential to making an encyclopedia usable as a work of reference. There have historically been two main methods of organizing printed encyclopedias: the alphabetical method (consisting of a number of separate articles, organised in alphabetical order), or organization by hierarchical categories. The former method is today the most common by far, especially for general works. The fluidity of electronic media, however, allows new possibilities for multiple methods of organization of the same content. Further, electronic media offer previously unimaginable capabilities for search, indexing and cross reference. The epigraph from Horace on the title page of the 18th century Encyclopédie suggests the importance of the structure of an encyclopedia: "What grace may be added to commonplace matters by the power of order and connection."
- As modern multimedia and the information age have evolved, they have had an ever-increasing effect on the collection, verification, summation, and presentation of information of all kinds. Projects such as Everything2, Encarta, h2g2, and Wikipedia are examples of new forms of the encyclopedia as information retrieval becomes simpler.
Some works entitled "dictionaries" are actually similar to encyclopedias, especially those concerned with a particular field (such as the Dictionary of the Middle Ages, the Dictionary of American Naval Fighting Ships, and Black's Law Dictionary). The Macquarie Dictionary, Australia's national dictionary, became an encyclopedic dictionary after its first edition in recognition of the use of proper nouns in common communication, and the words derived from such proper nouns.
There are some broad differences between encyclopedias and dictionaries. Most noticeably, encyclopedia articles are longer, fuller and more thorough than entries in most general-purpose dictionaries. There are differences in content as well. Generally speaking, dictionaries provide linguistic information about words themselves, while encyclopedias focus more on the thing for which those words stand. Thus, while dictionary entries are inextricably fixed to the word described, encyclopedia articles can be given a different entry name. As such, dictionary entries are not fully translatable into other languages, but encyclopedia articles can be.
In practice, however, the distinction is not concrete, as there is no clear-cut difference between factual, "encyclopedic" information and linguistic information such as appears in dictionaries. Thus encyclopedias may contain material that is also found in dictionaries, and vice versa. In particular, dictionary entries often contain factual information about the thing named by the word.
Encyclopedias have progressed from the beginning of history in written form, through medieval and modern times in print, and most recently, displayed on computer and distributed via computer networks.
Ancient times 
One of the earliest encyclopedic works to have survived to modern times is the Naturalis Historia of Pliny the Elder, a Roman statesman living in the 1st century AD. He compiled a work of 37 chapters covering natural history, architecture, medicine, geography, geology, and all aspects of the world around him. He stated in the preface that he had compiled 20,000 facts from 2000 works by over 200 authors, and added many others from his own experience. The work was published around AD 77-79, although he probably never finished proofing the work before his death in the eruption of Vesuvius in AD 79.
Middle Ages 
Saint Isidore of Seville, one of the greatest scholars of the early Middle Ages, is widely recognized as being the author of the first known encyclopedia of the Middle Ages, the Etymologiae or Origines (around 630), in which he compiled a sizable portion of the learning available at his time, both ancient and modern. The encyclopedia has 448 chapters in 20 volumes, and is valuable because of the quotes and fragments of texts by other authors that would have been lost had they not been collected by Saint Isidore.
The early Muslim compilations of knowledge in the Middle Ages included many comprehensive works. Around year 960, the Brethren of Purity of Basra were engaged in their Encyclopedia of the Brethren of Purity. Notable works include Abu Bakr al-Razi's encyclopedia of science, the Mutazilite Al-Kindi's prolific output of 270 books, and Ibn Sina's medical encyclopedia, which was a standard reference work for centuries. Also notable are works of universal history (or sociology) from Asharites, al-Tabri, al-Masudi, Tabari's History of the Prophets and Kings, Ibn Rustah, al-Athir, and Ibn Khaldun, whose Muqadimmah contains cautions regarding trust in written records that remain wholly applicable today.
The enormous encyclopedic work in China of the Four Great Books of Song, compiled by the 11th century AD during the early Song Dynasty (960–1279), was a massive literary undertaking for the time. The last encyclopedia of the four, the Prime Tortoise of the Record Bureau, amounted to 9.4 million Chinese characters in 1,000 written volumes.
These works were all hand copied and thus rarely available, beyond wealthy patrons or monastic men of learning: they were expensive, and usually written for those extending knowledge rather than those using it.
During Renaissance the creation of printing allowed a wider diffusion of encyclopedias and every scholar could have his or her own copy. The De expetendis et fugiendis rebus by Giorgio Valla was posthumously printed in 1501 by Aldo Manuzio in Venice. This work followed the traditional scheme of liberal arts. However, Valla added the translation of ancient Greek works on mathematics (firstly by Archimedes), newly discovered and translated. The Margarita Philosophica by Gregor Reisch, printed in 1503, was a complete encyclopedia explaining the seven liberal arts.
The term encyclopaedia was coined by 15th century humanists who misread copies of their texts of Pliny and Quintilian, and combined the two Greek words "enkyklios paideia" into one word. The phrase enkyklios paideia (ἐγκύκλιος παιδεία) was used by Plutarch and the Latin word Encyclopedia came from him.
The first work titled in this way was the Encyclopedia orbisque doctrinarum, hoc est omnium artium, scientiarum, ipsius philosophiae index ac divisio written by Johannes Aventinus in 1517.
The English physician and philosopher, Sir Thomas Browne used the word 'encyclopaedia' in 1646 in the preface to the reader to define his Pseudodoxia Epidemica, a major work of the 17th scientific revolution. Browne structured his encyclopaedia upon the time-honoured schemata of the Renaissance, the so-called 'scale of creation' which ascends through the mineral, vegetable, animal, human, planetary and cosmological worlds. Pseudodoxia Epidemica was a European best-seller, translated into French, Dutch and German as well as Latin it went through no less than five editions, each revised and augmented, the last edition appearing in 1672.
18th–19th centuries 
The beginnings of the modern idea of the general-purpose, widely distributed printed encyclopedia precede the 18th century encyclopedists. However, Chambers' Cyclopaedia, or Universal Dictionary of Arts and Sciences (1728), and the Encyclopédie of Diderot and D'Alembert (1751 onwards), as well as Encyclopædia Britannica and the Conversations-Lexikon, were the first to realize the form we would recognize today, with a comprehensive scope of topics, discussed in depth and organized in an accessible, systematic method. Chambers, in 1728, followed the earlier lead of John Harris's Lexicon Technicum of 1704 and later editions (see also below); this work was by its title and content "A Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves".
During the 19th and early 20th century, many smaller or less developed languages saw their first encyclopedias, using French, German, and English role models. While encyclopedias in larger languages, having large markets that could support a large editorial staff, churned out new 20-volume works in a few years and new editions with brief intervals, such publication plans often spanned a decade or more in smaller languages.
20th century 
The second half of the 20th century also saw the proliferation of specialized encyclopedias that compiled topics in specific fields. This trend has continued. Encyclopedias of at least one volume in size now exist for most if not all academic disciplines, including such narrow topics such as bioethics and African American history.
By the late 20th century, encyclopedias were being published on CD-ROMs for use with personal computers. Microsoft's Encarta, launched in 1993, was a landmark example as it had no printed equivalent. Articles were supplemented with video and audio files as well as numerous high-quality images. After sixteen years, Microsoft discontinued the Encarta line of products in 2009.
Twenty-first century 
On-line encyclopedias offer the additional advantage of being dynamic: new information can be presented almost immediately, rather than waiting for the next release of a static format, as with a disk- or paper-based publication. The 21st century has seen the dominance of wikis as popular encyclopedias, including Wikipedia among many others.
The word "encyclopaedia" comes from mistaken Classical Greek "ἐγκύκλιος παιδεία", transliterated "enkyklios paideia"; "enkyklios" (ἐγκύκλιος), meaning "circular, recurrent, required regularly, general" + "paideia" (παιδεία), meaning "education". Together, the phrase literally translates as "common knowledge" or "general knowledge". Copyists of Latin manuscripts took this phrase to be a single Greek word, "enkuklopaedia", with the same meaning, and this spurious Greek word became the New Latin word "encyclopaedia", which in turn came into English. Though the notion of a compendium of knowledge dates back thousands of years, the term was first used in the title of a book in 1517 by Johannes Avenarius: Encyclopedia orbisque doctrinarum, hoc est omnium artium, scientiarum, ipsius philosophiae index ac divisio, and in 1541 by Joachimus Fortius Ringelbergius, Lucubrationes vel potius absolutissima kyklopaideia (Basel, 1541). The word encyclopaedia was first used as a noun in the title of his book by the Croatian encyclopedist Pavao Skalić in his Encyclopaedia seu orbis disciplinarum tam sacrarum quam prophanarum epistemon (Encyclopaedia, or Knowledge of the World of Disciplines, Basel, 1559).[dubious ] One of the oldest vernacular uses was by François Rabelais in his Pantagruel in 1532.
Several encyclopedias have names that include the suffix -p(a)edia, e.g., Banglapedia (on matters relevant for Bengal).
In British usage, the spellings encyclopedia and encyclopaedia are both current. Although the latter spelling is considered more "proper" by British speakers, the former is becoming increasingly common in British English, in part due to the spread of American English. In American usage, only the former is commonly used. The spelling encyclopædia—with the æ ligature—was frequently used in the 19th century and is increasingly rare, although it is retained in product titles such as Encyclopædia Britannica and others. The Oxford English Dictionary (1989) records encyclopædia and encyclopaedia as equal alternatives (in that order), and notes the æ would be obsolete except that it is preserved in works that have Latin titles. Webster's Third New International Dictionary (1997–2002) features encyclopedia as the main headword and encyclopaedia as a minor variant. In addition, cyclopedia and cyclopaedia are now rarely used shortened forms of the word originating in the 17th century.
See also 
- "encyclopaedia" (online). Oxford English Dictionary (OED.com), Oxford University Press. Retrieved 2012-02-18.
- "Encyclopedia.". Archived from the original on 2007-08-03. Glossary of Library Terms. Riverside City College, Digital Library/Learning Resource Center. Retrieved on: November 17, 2007.
- Hartmann, R. R. K.; James, Gregory; Gregory James (1998). Dictionary of Lexicography. Routledge. p. 48. ISBN 0-415-14143-5. Retrieved July 27, 2010.
- Béjoint, Henri (2000). Modern Lexicography, pp. 30–31. Oxford University Press. ISBN 0-19-829951-6
- "Encyclopaedia". Encyclopædia Britannica. Retrieved July 27, 2010. "An English lexicographer, H.W. Fowler, wrote in the preface to the first edition (1911) of The Concise Oxford Dictionary of Current English that a dictionary is concerned with the uses of words and phrases and with giving information about the things for which they stand only so far as current use of the words depends upon knowledge of those things. The emphasis in an encyclopedia is much more on the nature of the things for which the words and phrases stand."
- Hartmann, R. R. K.; Gregory James (1998). Dictionary of Lexicography. Routledge. p. 49. ISBN 0-415-14143-5. Retrieved July 27, 2010. "In contrast with linguistic information, encyclopedia material is more concerned with the description of objective realities than the words or phrases that refer to them. In practice, however, there is no hard and fast boundary between factual and lexical knowledge."
- Cowie, Anthony Paul (2009). The Oxford History of English Lexicography, Volume I. Oxford University Press. p. 22. ISBN 0-415-14143-5. Retrieved August 17, 2010. "An 'encyclopedia' (encyclopaedia) usually gives more information than a dictionary; it explains not only the words but also the things and concepts referred to by the words."
- Ἐγκυκλοπαιδεία, Henry George Liddell, Robert Scott, A Greek–English Lexicon, at Perseus project
- Ἐγκύκλιος παιδεία, Quintilian, Institutio Oratoria, 1.10.1, at Perseus project
- Ἐγκύκλιος, Henry George Liddell, Robert Scott, A Greek–English Lexicon, at Perseus project
- Παιδεία, Henry George Liddell, Robert Scott, A Greek–English Lexicon, at Perseus project
- According to some accounts such as the American Heritage Dictionary copyists of Latin manuscripts took this phrase to be a single Greek word, enkuklopaedia,
- Denis Diderot and Jean le Rond d'Alembert Encyclopédie. University of Michigan Library:Scholarly Publishing Office and DLXS. Retrieved on: November 17, 2007
- Hartmann, R. R. K.; James, Gregory; Gregory James (1998). "Encyclopedic definition". Dictionary of Lexicography (Routledge): 48–49. ISBN 0-415-14143-5. Retrieved July 27, 2010. "Usually these two aspects overlap – encyclopedic information being difficult to distinguish from linguistic information – and dictionaries attempt to capture both in the explanation of a meaning..."
- Béjoint, Henri (2000). Modern Lexicography. Oxford University Press. p. 31. ISBN 0-19-829951-6. "The two types, as we have seen, are not easily differentiated; encyclopedias contain information that is also to be found in dictionaries, and vice versa."
- Naturalis Historia
- P.D. Wightman (1953), The Growth of Scientific Ideas
- See "Encyclopedia" in Dictionary of the Middle Ages.
- "Important Notice: MSN Encarta to be Discontinued". MSN Encarta. Archived from the original on 2009-10-31.
- The Compact Edition of the Oxford English Dictionary, Volume I A-O. Oxford University Press. 1971. p. 861.
- Bert Roest (1997). "Compilation as Theme and Praxis in Franciscan Universal Chronicles". In Peter Binkley. Pre-Modern Encyclopaedic Texts: Proceedings of the Second Comers Congress, Groningen, 1 – July 4, 1996. BRILL. p. 213. ISBN 90-04-10830-0.
- Sorcha Carey (2003). "Two Strategies of Encyclopaedism". Pliny's Catalogue of Culture: Art and Empire in the Natural History. Oxford University Press. p. 17. ISBN 0-19-925913-5.
- "encyclopaedia", Chambers Reference Online; "encyclopaedia"[dead link], AskOxford.
- "encyclopaedia"[dead link], Bartleby.com; "Encyclopaedia", Merriam Webster.
- "Encyclopaedia". Encyclopædia Britannica. Retrieved July 27, 2010.
- Béjoint, Henri (2000). Modern Lexicography. Oxford University Press. ISBN 0-19-829951-6.
- Bergenholtz, H., Nielsen, S., Tarp, S., ed. (2009). Lexicography at a Crossroads: Dictionaries and Encyclopedias Today, Lexicographical Tools Tomorrow. Peter Lang. ISBN 978-3-03911-799-4.
- Blom, Phillip (2004). Enlightening the World: Encyclopédie, the Book that Changed the Course of History. New York; Basingstoke: Palgrave Macmillan. ISBN 978-1-4039-6895-1. OCLC 57669780.
- Collison, Robert Lewis (1966). Encyclopaedias: Their History Throughout the Ages (2nd ed.). New York, London: Hafner. OCLC 220101699.
- Cowie, Anthony Paul (2009). The Oxford History of English Lexicography, Volume I. Oxford University Press. ISBN 0-415-14143-5. Retrieved August 17, 2010.
- Darnton, Robert (1979). The business of enlightenment : a publishing history of the Encyclopédie, 1775–1800. Cambridge: Belknap Press. ISBN 0-674-08785-2.
- Hartmann, R. R. K.; James, Gregory; Gregory James (1998). Dictionary of Lexicography. Routledge. ISBN 0-415-14143-5. Retrieved July 27, 2010.
- Kafker, Frank A., ed. (1981). Notable encyclopedias of the seventeenth and eighteenth centuries: nine predecessors of the Encyclopédie. Oxford: Voltaire Foundation. ISBN 978-0-7294-0256-9. OCLC 10645788.
- Kafker, Frank A., ed. (1994). Notable encyclopedias of the late eighteenth century: eleven successors of the Encyclopédie. Oxford: Voltaire Foundation. ISBN 978-0-7294-0467-9. OCLC 30787125.
- Needham, Joseph (1986). "Part 7, Military Technology; the Gunpowder Epic". Science and Civilization in China. 5 – Chemistry and Chemical Technology. Taipei: Caves Books Ltd. ISBN 978-0-521-30358-3. OCLC 59245877.
- Rosenzweig, Roy (June 2006). "Can History Be Open Source? Wikipedia and the Future of the Past". Journal of American History 93 (1): 117–46. doi:10.2307/4486062. ISSN 1945-2314.
- Walsh, S. Padraig (1968). Anglo-American general encyclopedias: a historical bibliography, 1703–1967. New York: Bowker. p. 270. OCLC 577541.
- Yeo, Richard R. (2001). Encyclopaedic visions : scientific dictionaries and enlightenment culture. Cambridge, New York: Cambridge University Press. ISBN 978-0-521-65191-2. OCLC 45828872.
|Wikimedia Commons has media related to: Encyclopedias|
|Look up encyclopedia, encyclopaedia, or encyclopedic in Wiktionary, the free dictionary.|
|Wikisource has original works on the topic: Encyclopedias|
- Hindupedia, encyclopedia of Hindu Dharma
- CNET's encyclopedia meta-search (includes Wikipedia)
- Encyclopaedia and Hypertext
- Internet Accuracy Project – Biographical errors in encyclopedias and almanacs
- Encyclopedia – Diderot's article on the Encyclopedia from the original Encyclopédie.
- De expetendis et fugiendis rebus – First Renaissance encyclopedia
- Science Dictionary – Online Comprehensive Science Encyclopedia
- Errors and inconsistencies in several printed reference books and encyclopedias
- Digital encyclopedias put the world at your fingertips – CNET article
- Encyclopedias online University of Wisconsin – Stout listing by category
- Chambers' Cyclopaedia, 1728, with the 1753 supplement
- Encyclopædia Americana, 1851, Francis Lieber ed. (Boston: Mussey & Co.) at the University of Michigan Making of America site
- Encyclopædia Britannica, articles and illustrations from 9th ed., 1875–89, and 10th ed., 1902–03.
- Encyclopædia Britannica, 11th ed., 1911, at the LoveToKnow site.
- Encyclopedia Sites list
- Texts on Wikisource:
- "Cyclopædia". Collier's New Encyclopedia. 1921.
- "Encyclopædia". Encyclopedia Americana. 1920.
- "Encyclopædia". The New Student's Reference Work. 1914.
- "Encyclopaedia". Encyclopædia Britannica (11th ed.). 1911.
- "Encyclopædia". The Nuttall Encyclopædia. 1907.
- "Encyclopædia". New International Encyclopedia. 1905.
- "Cyclopædia". The American Cyclopædia. 1879.