Fifteen (noun)

The cardinal number that is equal to the sum of 14 + 1.

Origin:

From middle english, from old english fīftēne, from fīf (“five”) + -tēne (ending denoting multiple of ten) (compare german fünfzehn).

Examples:

1. Fifteen is the age at which one can obtain a driver's permit.
2. I have fifteen apples in my basket.
3. The classroom has fifteen desks.
4. She waited fifteen minutes for the bus.
5. My son scored fifteen points in his basketball game.