n A person charged with guarding or caring for, storing, or maintaining something; a custodian, a guard. Short form of gamekeeper (w:Gamekeeper|Wikipedia).
n (sports) The player charged with guarding a goal or wicket. Short form of goalkeeper, wicketkeeper.
n A part of a mechanism that catches or retains another part, for example the part of a door lock that fits in the frame and receives the bolt.
n (American football) An offensive play in which the quarterback runs toward the goal with the ball after it is snapped.