one, 1, I, ace, single, unity

the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one"

• monad, monas — a singular metaphysical entity from which material properties are said to derive
• singleton — a single object (as distinguished from a pair)

• digit, figure — one of the elements that collectively form a system of numbers