Definitions
1.nounThe digit or figure 9.
2.nounA playing card with nine pips.
3.nounA nine-millimeter semi-automatic pistol.
4.noun(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.nounA baseball club, team, or lineup (composed of nine players).
6.numeralA numerical value equal to 9; the number following eight and preceding ten.
7.numeralDescribing a group or set with nine elements."A cat has nine lives."