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4 definitions found
 for compression
From 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]

From WordNet (r) 3.0 (2006) :

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

From 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
  
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  compression
  compaction
  uncompression
  
     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/)">(ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/).
  
     Web Content Compression FAQ
     
  http://perl.apache.org/docs/tutorials/client/compression/compression.html)">(http://perl.apache.org/docs/tutorials/client/compression/compression.html).
  
     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.
  
     (2004-04-26)
  

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