one, 1, I, ace, single, unity (adj)

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"

one, 1, i, ane (adj)

used of a single unit or thing; not two or more

"`ane' is Scottish"

1 (Symbol)

1.

1

1 (one, also called unit, unity, and (multiplicative) identity) is a number, and a numerical digit used to represent that number in numerals. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1. It is also the first of the infinite sequence of natural numbers, followed by 2.