compressibilˈity noun

1. The property of being reduced in volume by pressure
2. The ratio of the amount of compression per unit volume to the compressing force applied
3. A shock-wave phenomenon causing increased drag, which asserts itself when an aircraft in flight approaches the speed of sound, the hypothesis of the air as an incompressible fluid being no longer valid (aerodynamics)

compressˈible adjective

That may be compressed

compressˈibleness noun

compression /kəm-preshˈən/ noun

1. The act of compressing
2. The state of being compressed or condensed
3. Flattening
4. Deformation by pressure
5. The stroke that compresses the gases in an internal-combustion engine

compressˈional adjective

compressˈive adjective

Tending to compress

compressˈor noun

1. Anything that compresses or raises pressure, such as a device that compresses air or gas
2. A muscle that compresses certain parts

compressure /-preshˈər/ noun

compressed air noun

Air at more than atmospheric pressure

compression-ignition engine noun

An internal-combustion engine in which ignition of the liquid fuel injected into the cylinder is performed by the heat of compression of the air charge

compression joint noun

A joint between two pipes, the seal being created by tightening a threaded nut onto a metal ring

compression ratio noun

(in an internal-combustion engine) the ratio of the maximum to the minimum volume enclosed by the cylinder