n. 压缩, 压紧

[计] 压缩

[化] 压缩

[医] 压迫, 加压, 压缩

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

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]