Definition of gate:
a movable barrier in a fence or wall
a computer circuit with several inputs but only one output that can be activated by particular combinations of inputs
total admission receipts at a sports event
passageway (as in an air terminal) where passengers can embark or disembark
supply with a gate; "The house was gated"
control with a valve or other device that functions like a gate
restrict (school boys') movement to the dormitory or campus as a means of punishment