nine

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

• One more than eight, or one less than ten; thrice three: a cardinal numeral.
• noun The number consisting of the sum of one and eight; the number less by unity than ten; three times three.
• noun A symbol representing nine units, as 9, or IX, or ix.
• noun The body of players, nine in number, composing one side in a game of base-ball.
• noun A playing-card with nine spots or pips on it.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Eight and one more; one less than ten.
• adjective See Morris.
• adjective (Geom.) a circle so related to any given triangle as to pass through the three points in which the perpendiculars from the angles of the triangle upon the opposite sides (or the sides produced) meet the sides. It also passes through the three middle points of the sides of the triangle and through the three middle points of those parts of the perpendiculars that are between their common point of meeting and the angles of the triangle. The circle is hence called the nine points circle or six points circle.
• noun The number greater than eight by a unit; nine units or objects.
• noun A symbol representing nine units, as 9 or ix.
• noun A group of nine people.
• noun the nine Muses.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun cardinal A numerical value equal to 9; the number occurring after eight and before ten.
• noun Describing a set or group with nine components.
• noun The digit or figure 9.
• noun card games A playing card with nine pips.
• noun weaponry A nine-millimeter semi-automatic pistol.
• noun computing, engineering, usually in plural A statistical unit of proportion (of reliability, purity, etc.).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun one of four playing cards in a deck with nine pips on the face
• noun the cardinal number that is the sum of eight and one
• noun a team of professional baseball players who play and travel together
• adjective denoting a quantity consisting of one more than eight and one less than ten