Seventeen (noun)

The cardinal number occurring after sixteen and before eighteen.

Origin:

From middle english seventene, from old english seofontīene, from proto-germanic *sebuntēhun.

Examples:

1. Seventeen is the age at which many teenagers get their driver's license.
2. There are seventeen syllables in a haiku poem.
3. She has been alive for seventeen years now.
4. He scored seventeen points in the basketball game.
5. The concert starts at seventeen hundred hours.