Idioms, Phrasal Verbs Related to Once
Origin of Once
From Middle English ones (genitive of on (“one") used adverbally), from Old English ānes (“of one"), genitive of ān (“one"). Compare Old Saxon Ä“nes (Dutch eens, “once"), Old High German einÄ“st (“once") (German einst). More at one, -s.
Middle English ones from on one from Old English ān oi-no- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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