# compression
## English
### Etymology

Borrowed from Middle French compression, from Latin compressiō.

### Pronunciation

* (Received Pronunciation, General American, Canada) IPA: /kəmˈpɹɛʃ.ən/
** Audio (Southern England):(file)
* (General Australian, New Zealand) IPA: /kəmˈpɹeʃ.ən/
* Rhymes: -ɛʃən

### Noun

compression (countable and uncountable, plural compressions)
* An increase in density; the act of compressing, or the state of being compressed; compaction.
* (automotive) The cycle of an internal combustion engine during which the fuel and air mixture is compressed.
* (computing) The process by which data is compressed.
** 2011, Marcelo A. Montemurro, Damián H. Zanette, “Universal Entropy of Word Ordering Across Linguistic Families”, in PLoS ONE‎, retrieved 2012-09-26:Due to the presence of long-range correlations in language [21], [22] it is not possible to compute accurate measures of the entropy by estimating block probabilities directly. More efficient nonparametric methods that work even in the presence of long-range correlations are based on the property that the entropy of a sequence is a lower bound to any lossless compressed version of it [15]. Thus, in principle, it is possible to estimate the entropy of a sequence by finding its length after being compressed by an optimal algorithm. In our analysis, we used an efficient entropy estimator derived from the Lempel-Ziv compression algorithm that converges to the entropy [19], [23], [24], and shows a robust performance when applied to correlated sequences [25] (see Materials and Methods).
* (music) The electronic process by which any sound's gain is automatically controlled.
* (astronomy) The deviation of a heavenly body from a spherical form.

#### Antonyms

* decompression
* rarefaction

#### Derived terms

* age compression
* aortocaval compression syndrome
* companding
* compansion
* compressional
* compression fracture
* compressionless
* compression pump
* compression ratio
* compression release
* compression set
* compression shorts
* compression sock
* compression wave
* compression wood
* cryocompression
* data compression
* effective compression
* electrocompression
* globe of compression
* microcompression
* New York compression
* noncompression
* overcompression
* parallel compression
* precompression
* recompression
* selective compression
* supercompression
* thermocompression
* time compression
* time-space compression
* uncompression
* vasocompression

#### Translations

    The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

### References

* Compression in the Encyclopædia Britannica (11th edition, 1911)

## French
### Etymology

First known attestation 1314, borrowed from Latin compressiōnem.

### Pronunciation

* Audio:(file)

### Noun

compression f (plural compressions)
* compression (act, instance of compressing)
* compression (cycle of an internal combustion engine)

### Further reading

* “compression”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Middle French
### Etymology

Old French, borrowed from Latin compressiō.

### Noun

compression f (plural compressions)
* compression (act, instance of compressing)
** 1585, Giovanni Marinelli, Thresor des remedes secrets pour les maladies des femmes, page 761:compression du ventrecompression of the abdomen

## Old French
### Etymology

First known attestation 1314, borrowed from Latin compressiō.

### Noun

compression oblique singular, f (oblique plural compressions, nominative singular compression, nominative plural compressions)
* compression (act, instance of compressing)