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one

Part of speech: Noun

The first number used in counting by units; the sign representing it, as 1 or I; a single person or thing.

Part of speech: Pronoun

A certain person or thing considered indefinitely; anybody; as, one must take care.

Part of speech: Adjective

Single in number; united; as, they answered with one voice; individual; a certain; as, one Henry; the same.

Usage examples "one":
  • You can have one, if you like. - "The Project Gutenberg Plays of John Galsworthy, Complete", John Galsworthy.
  • I suppose that's one reason. - "Vane of the Timberlands", Harold Bindloss.