AskDefine | Define compress

Dictionary Definition

compress n : a cloth pad or dressing (with or without medication) applied firmly to some part of the body (to relieve discomfort or reduce fever)


1 make more compact by or as if by pressing; "compress the data" [syn: compact, pack together] [ant: decompress]
2 squeeze or press together; "she compressed her lips"; "the spasm contracted the muscle" [syn: constrict, squeeze, compact, contract, press]

User Contributed Dictionary



  • (noun):
    • (RP): /ˈkɒmprɛs/, /"kQmprEs/
    • (US): kŏm'prĕs, /ˈkɑmprɛs/, /"kAmprEs/
  • (verb): kəmprĕs', /kəmˈprɛs/, /k@m"prEs/
    Rhymes: -ɛs


  1. A folded piece of cloth, a pouch of ice, etc., used to cover the dressing of wounds, and placed with the aid of a bandage to apply pressure on an injury.
    He held a cold compress over the sprain.


cloth used to dress or apply pressure to wounds


  1. To make smaller; to press or squeeze together, or to make something occupy a smaller space or volume.
    The force required to compress a spring varies linearly with the displacement.
  2. To condense or abridge.
    If you try to compress the entire book into a three-sentence summary, you will lose a lot of information.



Derived terms


press into a smaller space
condense, abridge

Related terms

Extensive Definition

compress is a UNIX compression program based on the LZC compression method, which is an LZW implementation using variable size pointers as in LZ78.

Description of program

Files compressed by compress are typically given the extension .Z. Most tar programs will pipe their data through compress when given the command line option -Z (tar in itself does not compress, it just stores multiple files within one tape archive file).
Files can be returned to their original state using uncompress. The usual action of the program is not to create an uncompressed copy of the file, but to uncompress the compressed file (so that the uncompressed version retains the timestamp and other attributes of the compressed file).
The LZW algorithm used in compress was patented by Sperry Research Center in 1983. The person who applied for the patent published an IEEE article on the algorithm in 1984, without mentioning that the algorithm was patent pending. Spencer Thomas took this article and implemented compress in 1984, without realizing that the LZW algorithm was patent pending. (The GIF image format also incorporated LZW compression in this way and later Unisys claimed royalties on implementations of GIF.) Joseph M. Orost led the team and worked with Spencer et al. to create the 'final' (4.0) version of compress and published it as free software to the 'comp.sources.unix' USENET group in 1985. The patent on LZW compression was granted in 1985 and this is why compress could not be used without paying royalties to Sperry Research (which became Unisys). compress has fallen out of favor in particular user-groups because it makes use of the LZW algorithm, which is covered by UNISYS and IBM patents — because of this, gzip and bzip2 increased in popularity on Linux-based operating systems due to their alternative algorithms. compress has however maintained a presence on Unix and BSD systems. The LZW patent expired in 2003, so it is now in the public domain in the United States.

'compress' for Mac OS X

There is also a Freeware Mac OS X application with the same name; but it is completely unrelated with the former. This program supports the zip, 7z, bzip2, gzip, and tar formats. A much earlier program dating from the 1980s, MacCompress, is a Mac OS GUI wrapper for compress, but has not been used for some time. The Darwin operating system includes a compress utility as described above, accessed from A Drive.

External links


compress in German: compress
compress in French: compress
compress in Japanese: UNIX Compress
compress in Korean: 유닉스 compress

Synonyms, Antonyms and Related Words

Ace bandage, Band-Aid, abbreviate, abridge, abstract, adhesive tape, application, band, bandage, bandaging, bear, binder, bob, boil down, brace, capsulize, cast, cataplasm, circumscribe, clamp, clip, coarct, compact, concentrate, condense, congest, consolidate, constrict, constringe, contract, cotton, court plaster, cram, cramp, cravat, crop, crowd, crush, curtail, cut, cut back, cut down, cut off short, cut short, damp, dampen, decrease, deduct, deflate, densen, densify, depreciate, depress, diminish, dock, downgrade, draw, draw in, draw together, dressing, elastic bandage, elide, ensphere, epithem, epitomize, foreshorten, four-tailed bandage, gauze, jam, knit, lessen, lint, lower, mow, narrow, nip, pare, pinch, plaster, plaster cast, pledget, poll, pollard, poultice, press, prune, pucker, pucker up, purse, push, ram down, reap, recap, recapitulate, reduce, retrench, roll back, roller, roller bandage, rubber bandage, scale down, shave, shear, shorten, shrink, simplify, sling, snub, solidify, splint, sponge, squab, squash, squeeze, squish, step down, strangle, strangulate, stunt, stupe, sum up, summarize, synopsize, take from, take in, tampon, tape, telescope, tent, tighten, tourniquet, triangular bandage, trim, truncate, tune down, tweak, wad up, wrinkle
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