Compression

Compression
Compression Com*pres"sion, n. [L. compressio: cf. F. compression.] 1. The act of compressing, or state of being compressed. ``Compression of thought.'' --Johnson. [1913 Webster]

2. (Computers) reduction of the space required for storage (of binary data) by an algorithm which converts the data to a smaller number of bits while preserving the information content. The act of compressing [3].

Note: Compression may be {lossless compression}, in which all of the information in the original data is preserved, and the original data may be recovered in form identical to its original form; or {lossy compression}, in which some of the information in the original data is lost, and decompression results in a data form slightly different from the original. {Lossy compression} is used, for example, to compress audio or video recordings, and sometimes images, where the slight differences in the original data and the data recovered after {lossy compression} may be imperceptable to the human eye or ear. The {JPEG} format is produced by a {lossy compression} algorithm. [PJC]


The Collaborative International Dictionary of English. 2000.

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  • compression — [ kɔ̃presjɔ̃ ] n. f. • 1361; lat. compressio, de comprimere 1 ♦ Action de comprimer. ⇒ pression. Compression de l air. La compression augmente la densité. Spécialt Phase précédant l explosion dans le cycle d un moteur à explosion. Taux de… …   Encyclopédie Universelle

  • Compression — may refer to: In physical science Compression (physical), the result of the subjection of a material to compressive stress Compression member, a class of structural elements, of which a column is the most common specific example Compressibility,… …   Wikipedia

  • compression — COMPRESSION. s. fém. Action de comprimer, ou l effet qui est produit dans ce qui est comprimé. La compression de l air …   Dictionnaire de l'Académie Française 1798

  • compression — c.1400, from M.Fr. compression (14c.), from L. compressionem (nom. compressio) a pressing together, noun of action from compress , pp. stem of comprimere (see COMPRESS (Cf. compress)). Related: Compressional wave (1887) …   Etymology dictionary

  • compression — Compression. s. f. v. L effet qui est produit dans ce qui est comprimé. La compression de l air …   Dictionnaire de l'Académie française

  • Compression — (v. lat.), Druck, Zusammendrückung; daher Compressionsfontaine, s. u. Springbrunnen; Compressionsgefäß der Feuerspritze, s. u. Feuerspritze; Compressionsinstrument, so v. w. Compressorium; Compressionskraft, so v. w. Druckkraft;… …   Pierer's Universal-Lexikon

  • compression — index abridgment (condensation), abstract, blockade (limitation), capsule, centralization, curtailment …   Law dictionary

  • Compression —   [engl.], Komprimierung …   Universal-Lexikon

  • compression — ► NOUN 1) the action of compressing or being compressed. 2) the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition. DERIVATIVES compressional adjective …   English terms dictionary

  • compression — [kəm presh′ən] n. [ME < OFr < L compressio] 1. a compressing or being compressed 2. Mech. the compressing of the air fuel mixture in an internal combustion engine just before ignition …   English World dictionary

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