The middle phases: Koine and Byzantine Greek
The fairly uniform spoken Greek that gradually replaced the local dialects after the breakdown of old political barriers and the establishment of Alexander’s empire in the 4th century bce is known as the Koine (hē koinē dialektos ‘the common language’), or “Hellenistic Greek.” Attic, by virtue of the undiminished cultural and commercial predominance of Athens, provided its basis, but, as the medium of communication throughout the new urban centres of Egypt, Syria, and Asia Minor, it absorbed numerous non-Attic elements and underwent some degree of grammatical simplification. Numerous inscriptions enable scholars to trace its triumphant progress at the expense of the old dialects, at least as the language of business and administration, although some rural dialects are reported to have survived as late as the 2nd century ce. Other sources of information for the Koine are the translation of the Septuagint made in the 3rd century bce for the use of the Hellenized Jewish community of Alexandria, the New Testament, and the writings of a few people (e.g., the historian Polybius and the philosopher Epictetus) who preferred it to Attic. As the everyday colloquial language of urban Egypt, it may be studied in papyri going back to the 4th century bce. The Koine may be dated very crudely from the period of Alexander’s conquests in the 4th century bce to approximately the reign of Justinian in the 6th century ce.
The Koine replaced the Attic tt with the ss characteristic of Ionic and other dialects (e.g., glōssa for glōtta ‘tongue’) at an early date, but its main phonological characteristic is the gradual simplification of the rich vowel system of Classical Greek. Ancient closed and open long /ē/ (ει and η) and /i/ (ι) merged as /i/, and /ai/ (αι) monophthongized to /e/; /oi/ (οι) monophthongized to /ü/, thus merging with simple /ü/ (υ) (pronounced as French tu). The second element of /au/ (αυ) and /eu/ (ευ) was changed to /v/ or /f/ depending on the voicing of the following consonant (compare Ancient auge ‘light, dawn,’ autos ‘he’ to Modern avghí, aftós). Classical /ph th kh/ (pronounced as in English pin, tin, kin) acquired fricative articulations as in fin, thin, and the final element of Scottish loch (or German Buch); /b d g/ became the voiced fricatives /v dh/ (as in that), /gh/ (as in Spanish fuego).
Other parts of the grammar also began to move in the direction of Modern Greek in this period. Nouns in consonant stems began to acquire the endings of the -a declension; e.g., thygatēr, ‘daughter,’ accusative thygatera, was remodeled after items such as khōra, khōran ‘country.’ The dual number was lost in nouns, verbs, and adjectives, as was the optative mood (expressing wish or desire) of verbs. Confusion arose between the perfect and aorist tense forms, leading to the loss of one or the other (the former in most verbs).
In vocabulary there were numerous borrowings from non-Attic dialects, and some Attic words acquired new meanings; thus, opsaria ‘fish’ and brechei ‘it rains’ for Classical Greek ichthyes and hyei both occur in the New Testament (compare Modern Greek psárya, vrékhi).
This gradual divergence from the language of Plato and Demosthenes was viewed as a species of linguistic decadence by an influential school known as the Atticists, who unceasingly castigated the use of Koine forms by writers. It was thus that the rift developed between the everyday spoken language and an archaizing, specifically written language. It became fashionable to publish manuals of “good usage” in which the Attic equivalents of Koine innovations were recommended as models for the student’s imitation.
During the period of the Byzantine Empire (i.e., until the fall of Constantinople in 1453) the language of administration and of most writing was firmly rooted in the Atticist tradition; it is this archaizing style that is often referred to as “Byzantine Greek.” The spoken language continued to develop apace, however, and its course can be followed to some extent in the writings of the less-educated chroniclers (such as John Malalas, 6th century) and hagiographers. Furthermore, the increasing political and military disintegration characteristic of the last few centuries preceding the fall of Constantinople brought with it a general decline in educational level, and works appeared that reflect quite closely the colloquial language of the time, although learned and pseudo-learned elements are never absent. While the differences between the Chronicle of the Morea (13th century), for example, and present-day spoken Greek are quite minor, Byzantium failed to produce a writer of the stature of Dante, capable of establishing once and for all the living vernacular as a worthy vehicle for great literature.
Most of the phonological and grammatical developments that separate present-day Greek from the Koine occurred during this period. Thus, in the phonology the two high front vowels /i/ and /ü/ were merged, simplifying the six-vowel system to the five-vowel system of Modern Greek. In the morphology the frequent misuse of the dative case of nouns shows that it went out of use in the spoken language, and the infinitive was replaced by various periphrastic constructions. (Periphrastic constructions involve the use of function words and auxiliaries.) In the earlier period numerous words (mostly Latin) were imported: the chronicler Malalas has (in their modern form) pórta ‘door,’ kámbos ‘plain,’ saíta ‘arrow,’ paláti ‘palace,’ spíti ‘house’ (from hospitium), and hundreds of other borrowings, not all of which have survived. The later period is characterized by the richness of its compound words, usually from native roots. Some of these, such as the compounds in which a modifying noun precedes its head noun, continued ancient patterns (thalassóvrakhi ‘sea rock,’ vunópulo ‘mountain lad’); coordinative compounds of the type common in Modern Greek, though rare in earlier periods, are also found (aristódhipnon ‘lunch and dinner,’ compare Modern Greek andróyino ‘man and wife,’ makheropíruna ‘knives and forks’). Semantic shift was another source of innovation: álogho ‘horse’ previously meant ‘irrational’; skiázome ‘I fear’ earlier meant ‘I am in shadow’; and (u)dhén ‘not’ meant, in Classical Greek, ‘nothing.’