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Definitions for compression:

The Collaborative International Dictionary of English v.0.48 :
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]

WordNet (r) 2.0 :
compression n 1: an increase in the density of something [syn: compaction, concretion, densification] 2: the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling" [syn: condensation, contraction] 3: encoding information while reducing the bandwidth or bits required [ant: decompression] 4: applying pressure [syn: compressing] [ant: decompression]

Moby Thesaurus II by Grady Ward, 1.0 :
74 Moby Thesaurus words for "compression": abbreviation, abridgment, abstract, agglutination, apocope, astriction, astringency, bottleneck, cervix, circumscription, clamping, clamping down, clumping, clustering, coarctation, compactedness, compaction, compressure, concentration, concretion, condensation, consolidation, conspectus, constriction, constringency, contraction, contracture, crush, curtailment, decrease, densification, diminuendo, elision, ellipsis, epitome, foreshortening, hardening, hourglass, hourglass figure, isthmus, knitting, narrow place, narrowing, neck, nip, pinch, precis, press, pressure, puckering, pursing, recap, recapitulation, reduction, retrenchment, shortening, solidification, squeeze, squeezing, stranglement, strangulation, striction, stricture, summary, summation, syncope, synopsis, systole, telescoping, tightening, truncation, tweak, wasp waist, wrinkling

The Free On-line Dictionary of Computing (27 SEP 03) :
compression 1. (Or "compaction") The coding of data to save storage space or transmission time. Although data is already coded in digital form for computer processing, it can often be coded more efficiently (using fewer bits). For example, {run-length encoding} replaces strings of repeated characters (or other units of data) with a single character and a count. There are many compression algorithms and utilities. Compressed data must be decompressed before it can be used. The standard Unix compression utilty is called compress though GNU's superior gzip has largely replaced it. Other compression utilties include pack, zip and PKZIP. When compressing several similar files, it is usually better to join the files together into an archive of some kind (using tar for example) and then compress them, rather than to join together individually compressed files. This is because some common compression algorithms build up tables based on the data from their current input which they have already compressed. They then use this table to compress subsequent data more efficiently. See also TIFF, JPEG, MPEG, {Lempel-Ziv Welch}, "lossy", "lossless". {Compression FAQ (ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/)}. Usenet newsgroups: {news:comp.compression}, {news:comp.compression.research}. 2. Reducing the dynamic range of an audio signal, making quiet sounds louder and loud sounds quieter. Thus, when discussing digital audio, the preferred term for reducing the total amount of data is "compaction". Some advocate this term in all contexts. (2001-01-30)

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