## As a numeral **one**

is (cardinal) a numerical value equal to ; the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set ordinal: first.

## As a pronoun **one**

is (

*lb*) one thing (among a group of others); one member of a group.

## As a noun **one**

is (mathematics) the neutral element with respect to multiplication in a.

## As an adjective **one**

is of a period of time, being particular; as, one morning, one year.

## As a verb **one**

is (obsolete|transitive) to cause to become one; to gather into a single whole; to unite.

## As an adverb **oones** is

(obsolete) once.