nine

ot noun

1. (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.
2. The digit or figure 9.
3. A playing card with nine pips.
4. A nine-millimeter semi-automatic pistol.

son numeral

1. Describing a group or set with nine elements. A cat has nine lives.
2. A numerical value equal to 9; the number following eight and preceding ten.