What is "jump seat"

Jump \Jump\, n.

1. The act of jumping; a leap; a spring; a bound. ``To advance by jumps.''
   --Locke.

2. An effort; an attempt; a venture. [Obs.]

   Our fortune lies Upon thisjump.
   --Shak.

3. The space traversed by a leap.

4. (Mining) A dislocation in a stratum; a fault.

5. (Arch.) An abrupt interruption of level in a piece of brickwork or masonry.

6. A jump-start; as, to get a jump from a passing mmotorist. From the jump, from the start or beginning. [Colloq.] Jump joint.

   1. A butt joint.

   2. A flush joint, as of plank in carvel-built vessels. Jump seat.

      1. A movable carriage seat.

      2. A carriage constructed with a seat which may be shifted so as to make room for second or extra seat. Also used adjectively; as, a jump-seat wagon.

n. 1 (context colloquial English) A spare seat in an aircraft cockpit. 2 (context dated English) A movable seat in a carriage.

n. a folding seat in an automobile

A jump seat (or jumpseat), in aviation refers to an auxiliary seat for individuals—other than normal passengers—who are not operating the aircraft. In general, the term 'jump seat' can also refer to a seat in any type of vehicle which can fold up out of the way; vehicles include carriages, automobiles, vans, buses, fire tenders, and taxicabs. The term originated in the USA c. 1860 for a movable carriage seat.

The term jump seat may refer to:

• Jump seat in aircraft
• Jumpseat (satellite)
• Jumping position, or two-point position in hunt seat English-style horse riding