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[kuh m-presh-uh n] /kəmˈprɛʃ ən/
the act of compressing.
the state of being compressed.
the effect, result, or consequence of being compressed.
(in internal-combustion engines) the reduction in volume and increase of pressure of the air or combustible mixture in the cylinder prior to ignition, produced by the motion of the piston toward the cylinder head after intake.
Also called data compression. Computers. reduction of the storage space required for data by changing its format.
Also, compressure
[kuh m-presh-er] /kəmˈprɛʃ ər/ (Show IPA),
(for defs 1, 2).
Origin of compression
1350-1400; Middle English (< Anglo-French) < Latin compressiōn- (stem of compressiō), equivalent to compress(us) past participle of comprimere to press together (see com-, press1) + -iōn- -ion
Related forms
compressional, adjective
noncompression, noun
overcompression, noun
precompression, noun
supercompression, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for precompression


Also called compressure (kəmˈprɛʃə). the act of compressing or the condition of being compressed
an increase in pressure of the charge in an engine or compressor obtained by reducing its volume
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for precompression



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.

Online Etymology Dictionary, © 2010 Douglas Harper
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precompression in Medicine

compression com·pres·sion (kəm-prěsh'ən)

  1. See condensation.

  2. The state of being compressed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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precompression in Science
  1. A force that tends to shorten or squeeze something, decreasing its volume.

  2. The degree to which a substance has decreased in size (in volume, length, or some other dimension) after being or while being subject to stress. See also strain.

  3. The re-encoding of data (usually the binary data used by computers) into a form that uses fewer bits of information than the original data. Compression is often used to speed the transmission of data such as text or visual images, or to minimize the memory resources needed to store such data.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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precompression in Culture

compression definition

See data compression.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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