- a cardinal number, 10 plus 3.
- a symbol for this number, as 13 or XIII.
- a set of this many persons or things.
- amounting to 13 in number.
- the cardinal number that is the sum of ten and three and is a prime number
- a numeral, 13, XIII, etc, representing this number
- the amount or quantity that is three more than ten; baker's dozen
- something represented by, representing, or consisting of 13 units
- amounting to thirteen
- (as pronoun)
