Am·​mo·​ni·​an | \əˈmōnēən, -nyən\

Definition of Ammonian 

: of or relating to Ammonius of Alexandria, reputed author of a harmony of the Gospels and a work on the agreement of the teachings of Moses and Jesus

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First Known Use of Ammonian

1793, in the meaning defined above

History and Etymology for Ammonian

Ammonius, 3d century Alexandrian Christian philosopher + English -an

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The first known use of Ammonian was in 1793

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living or existing for a long time

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