n.1. One that keeps, especially:
a. An attendant, a guard, or a warden.
b. One that has the charge or care of something: a lion keeper; the keeper of the budget.
c. A stationary fitting that catches or holds a moving part such as a latch or bolt.
d. Sports A goalkeeper.
2. Football A play made by the quarterback who keeps the ball after it is snapped and then runs with it.
3. Informal One that is worth keeping, especially a fish large enough to be legally caught and not returned to the water.