Definition of "nine"

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

Describing a group or set with nine elements.  examples

The digit or figure 9.  examples

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

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

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

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