the usu hinged frame or door that closes an opening in a wall or fence
a city or castle entrance, often with defensive structures
a means of entrance or exit; specif a numbered exit from an airport building to the airfield
a mountain pass
a mechanically operated barrier used as a starting device for a race
either of a pair of barriers that let water in and out of a lock or close a road at a level crossing
an electronic device, e.g. in a computer, that produces a defined output for every combination of input conditions
a logic gate
the set of notches in a manually worked gearbox into which the gear lever is pushed to select the gears
the total admission receipts or the number of spectators at a sporting event
the part of a film camera or projector that holds the film flat behind the lens