One of the mysteries of the English language finally explained.
1Of, belonging to, or designating the Allegheny Mountains in the eastern United States; native to or inhabiting this region.
2Geology. Designating a mountain-building episode of the Carboniferous period in North America in which the Allegheny and Appalachian mountain ranges were formed; of or relating to this episode.
Mid 18th century; earliest use found in George Whitefield (1714–1770), Calvinistic Methodist leader. From the name of the Allegheny Mountains (formerly also Allegany, Alleghany), running from Pennsylvania to Virginia in the eastern United States, forming part of the Appalachian mountain range + -an.
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