Webster's Revised Unabridged Dictionary · 1913

Ah

Ah ({not transcribed}) , interjection

[Old English a: compare Old French a, French ah, Latin ah, Greek {not transcribed}, Sk. ā, Icelandic a, Old High German ā, Lithuanian á, áá.]

An exclamation, expressive of surprise, pity, complaint, entreaty, contempt, threatening, delight, triumph, etc., according to the manner of utterance.