compress

American  

[kuhm-pres, kom-pres] / kəmˈprɛs, ˈkɒm prɛs /

verb (used with object)

1. to press together; force into less space.

   Synonyms:

   constrict, squeeze, condense

   Antonyms:

   lay, expand

2. to cause to become a solid mass.

   to compress cotton into bales.

3. to condense, shorten, or abbreviate.

   The book was compressed by 50 pages.

4. Computers. to reduce the storage space required for (data) by changing its format.

   The algorithm should compress the video file without losing any quality.

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noun

1. Medicine/Medical. a soft, cloth pad held in place by a bandage and used to provide pressure or to supply moisture, cold, heat, or medication.

2. an apparatus for compressing cotton bales.

3. a warehouse for storing cotton bales before shipment.

compress British  

verb

1. (tr) to squeeze together or compact into less space; condense

2. computing to apply a compression program to (electronic data) so that it takes up less space

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noun

1. a wet or dry cloth or gauze pad with or without medication, applied firmly to some part of the body to relieve discomfort, reduce fever, drain a wound, etc

2. a machine for packing material, esp cotton, under pressure

Related Words

See contract.

Other Word Forms

• compressible adjective
• compressibleness noun
• compressibly adverb
• compressingly adverb
• noncompressible adjective
• overcompress verb (used with object)
• precompress verb (used with object)
• uncompressible adjective

Etymology

Origin of compress

1350–1400; (v.) Middle English (< Middle French compresser ) < Late Latin compressāre, frequentative of Latin comprimere to squeeze together ( com-, press ¹ ); (noun) < Middle French compresse, noun derivative of the v.

Explanation

The noun compress refers to a pad that's held to your body to reduce pain or symptoms of illness. A washcloth dipped in cold water and pressed onto your forehead to help you cool down is a type of compress. As a verb, compress means to squeeze together with a fair amount of pressure. When you compress a sponge to get all the water out, you press it between your palms or squish it between your fingers. Compress can also mean to make something more compact — as with the sponge, when you compress an object it gets smaller. You could even compress a speech by cutting it down into a shorter but equally effective version.

Example Sentences

You cannot compress a barrel of oil with an algorithm.

From MarketWatch • Apr. 6, 2026

It does not compress the model’s permanent weights.

From MarketWatch • Apr. 6, 2026

“We spent years developing the mathematical theory required to compress a neural network without losing its reasoning capabilities,” said Hassibi, chief executive of the venture.

From The Wall Street Journal • Mar. 31, 2026

You pay more, compress margins and pass much of the additional cost on to customers.

From The Wall Street Journal • Mar. 24, 2026

Quickly he covered the whole wound with a large cotton compress and jerked his hand away.

From "Catch-22" by Joseph Heller

Related Words

• abbreviate
• constrict
• cram
• restrict
• shorten
• shrink
• squeeze
• wrap