Multiplied by one: indicating that a number is multiplied by one.
From Middle English ones, from Old English ānes, a remodelling (after ān) of ǣnes, itself an extension of ǣne with the genitival suffix -es. Compare Old Saxon ēnes ("once"), Old High German einēst ("once") (German einst). More at one (including regarding the development of the pronunciation) and -s.
Modern English dictionary
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