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1. A small folding seat, as in an automobile between the front and rear seats.
2. A small rear seat in a sports car.
1. (Aeronautics) a folding seat for temporary use, as on the flight deck of some aircraft for an additional crew member
2. (Automotive Engineering) Brit a folding seat in a motor vehicle such as in a London taxi
a movable or folding seat, as between the front and back seats in a taxicab, used as an extra seat.