Definition of "nine" in English

numeral

1. A numerical value equal to 9; the number following eight and preceding ten.

2. Describing a group or set with nine elements.

   • A cat has nine lives.

noun

1. The digit or figure 9.

2. (card games) A playing card with nine pips.

3. (weaponry) A nine-millimeter semi-automatic pistol.

4. (computing, engineering, usually in the plural) A statistical unit of proportion (of reliability, purity, etc.).

   • They guaranteed that our Web site would have 99.99% uptime, or four nines.

5. (baseball) A baseball club, team, or lineup (composed of nine players).

   • The St. Louis club is the only nine in the league which gives its patrons the right to see a full game or no pay.