nine (Adjective) — Denoting a quantity consisting of one more than eight and one less than ten.
nine (Noun) — The cardinal number that is the sum of eight and one.
nine (Noun) — A team of professional baseball players who play and travel together. ex. "each nine played six home games with teams in its own division"
nine (Noun) — One of four playing cards in a deck with nine pips on the face.