Etymology
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compression (n.)

c. 1400, "act of compressing, state of being compressed," from Old French compression (14c.) and directly from Latin compressionem (nominative compressio) "a pressing together," noun of action from past participle stem of comprimere "to squeeze" (see compress (v.)). Related: Compressional. Compressional wave is attested from 1887.

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Definitions of compression

compression (n.)
an increase in the density of something;
Synonyms: compaction / concretion / densification
compression (n.)
the process or result of becoming smaller or pressed together;
compression (n.)
encoding information while reducing the bandwidth or bits required;
compression (n.)
applying pressure;
Synonyms: compressing
From wordnet.princeton.edu