c.1400, from Middle French compression (14c.), from Latin compressionem (nominative compressio) "a pressing together," noun of action from past participle stem of comprimere (see compress (v.)). Related: Compressional. Compressional wave is attested from 1887.
compression com·pres·sion (kəm-prěsh'ən)
The state of being compressed.
A technique in information technology by which the same amount of data is transmitted by using a smaller number of bits; for example, by replacing a string of ten repeated digits with a command to repeat the digit ten times.
Note: Data compression is essential in technologies that transmit things like digitized movies in real time.
See data compression.