- a cardinal number, ten plus five.
- a symbol for this number, as 15 or XV.
- a set of this many persons or things.
- amounting to 15 in number.
- the cardinal number that is the sum of ten and five
- a numeral, 15, XV, etc, representing this number
- something represented by, representing, or consisting of 15 units
- a rugby union football team
- amounting to fifteen
- (as pronoun)
- the Jacobite rising of 1715
