The cardinal number equal to 8 + 1.
The ninth in a set or sequence.
Something having nine parts, units, or members.
Games A playing card marked with nine pips.
A set of nine persons or things, especially:
Baseball The nine players on a side, or the whole team.
Nine Greek Mythology The nine Muses.
A size, as in clothing or shoes, designated as nine.
Sports The first or second 9 holes of an 18-hole golf course.
to the nines
To perfection, to the highest degree; see under dressed to kill.
(nīn) 
in Indo-European roots.]