(mathematics) A vector space whose basis of real numbers has three vectors

(uncountable) The application of science and engineering to the exploration and utilization of outer space / (countable) Any particular scientific or engineering discipline used in this field

(uncountable) Flight into, from or through space. / (countable) A voyage in space.

The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre

(medicine) The loss of most motor function in all four limbs, normally caused by brain stem injury.

A gap, between two electrical terminals, across which sparks are generated. / Such a gap as a component of an engine's ignition system, especially that between the electrodes of a spark plug.

plural of spare tyre

An extra tyre carried in case one of the vehicle's tyres is damaged or deflated. / (idiomatic) A large paunch and rolls of fat around the waist.

Used other than figuratively or idiomatically: see spare, tire. / An extra wheel carried as a replacement in case of a flat. / (idiomatic) Excess weight or fat accumulated near the waist.

plural of sparrow hawk