What does compress mean?
Compress is primarily a verb meaning to press or squeeze something so that it takes up less space — whether physically, like flattening cardboard boxes for recycling, or digitally, as when software shrinks a large file for easier storage and transmission. By extension it can mean condensing information or an idea into a briefer form, as in compressing a speech into a few key points. The word also functions as a noun in medicine, where a compress is a soft pad, often hot or cold, applied firmly to the body to relieve swelling or pain. Derived from the Latin premere, 'to press', via past-participial forms, it entered English in the late fourteenth century and remains a versatile term spanning household chores, computing, and healthcare. Its derivatives include compression, compressor, and compressible.
To press or squeeze something into a smaller space; to force into less room.
"He compressed the air out of the plastic bottle before capping it."
Commonly extended to mean reducing the size or length of data, text, or time.
To encode data using fewer bits than its original representation.
"The software compresses images without noticeable loss of quality."
Standard in computing; may be lossless or lossy depending on method.
A soft pad, usually cloth, applied hot or cold and held under pressure against part of the body for therapeutic purposes.
"The nurse placed a warm compress over the patient's stiff shoulder."
Chiefly used in medical and first-aid contexts; stressed on the first syllable in British English.
Used mainly for the noun sense referring to multiple therapeutic pads; the plural of the verb sense does not apply.
"The clinic kept a supply of sterile compresses in every treatment room."
The same word that squeezes your zip files also names the folded pad a nurse presses on a wound — compress has been doing double duty since the 1600s.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of compress
Compress comes from Latin comprimere, formed from com- ('together') and premere ('to press'), with the past participle compressus supplying the stem. It entered Middle English in the late fourteenth century, initially as a verb of physical pressing. The medical noun sense arose later, and the modern computing sense is a twentieth-century development. Cognate forms from the same Latin root appear in words such as pressure, suppress, and impression.
Related word forms
How compress is actually used
As a verb it is standard in both everyday and technical contexts. As a noun meaning a medicinal pad, it is chiefly used in medical and first-aid settings; British English stresses the noun on its first syllable while American English typically keeps stress on the second syllable even in noun use.
Easily confused with compress
Compress means to press into less space; condense means to make denser or more concentrated, often by removing water or shortening text.