compression

n. pressing together, making smaller using pressure

Compression itself may refer to:Gas compression, raising the pressure and reducing the volume of gasesPhysical compression, the result of the subjection of a material to compressive stressCompression arch suspended-deck bridge, a compression arch rises above the deckCompression (geology), a system of forces that tend to decrease the volume of or shorten rocks.Compression in zoology and paleontology refers to where an animal, or part of an animal is shorter or narrower compared with other animals in the same group; eg the body of a lizard may be compressed (flattened) so it can better fit into crevices under rocks.Compression ratio, a number that predicts the performance of any internal-combustion engineData compression, encoding information using fewer bitsImage compressionAudio data compressionVideo compressionCompression artifact, noticeable defects in audio or video that has been compressedBandwidth compression, in telecommunicationsGain compression in electronic amplifiers, which is a result of device non-linearityAudio level compression, usually artificially introduced Gain compression to improve the perceived quality of audioCompression (functional analysis), in mathematicsCompression bandage, designed to reduce the flow of bloodCompression, the opposite of Tension.
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n. compression (Computers); compressing, squeeze, cut

(n.)
The act of compressing, or state of being compressed.
  

See data compression, signal compression.