How to say "compression" in Japanese

• 圧縮あっしゅくJLPT N2approx.Common
  noun, suru verb, transitive verbThe common word for compression: the act of pressing something into less space or reducing its volume, whether of gases, materials, or data. This is what you want when 'compression' has no special context.
  その気体きたいは圧縮あっしゅくされてボンベに詰め込つめこまれた。↗

  The gas was compressed into a gas cylinder.
• コンプレッション
  nounThe loanword, borrowed directly from English. It is less common than 圧縮, and outside specialist jargon you will normally want 圧縮 instead.
• 着圧ちゃくあつ
  nounCompression caused by tight-fitting clothing: the pressure that garments such as compression socks exert on the body. It covers only this clothing-related sense, not compression of objects or data.
• 圧迫性あっぱくせい
  nounNames a pressing or squeezing quality rather than the act of compression; the word denotes a property, not an action. It is seldom what you want for 'compression' itself — 圧縮 is the general term.
• 圧搾あっさく
  noun, suru verb, transitive verbAt heart this means 'pressing' or 'squeezing' rather than compression proper. As a rendering of 'compression' it is marginal; 圧縮 is the word for the general sense.

Choose 圧縮 for compression in the general sense; 「コンプレッション」 is the less common loanword; 着圧 means compression from tight-fitting clothing; 圧迫性 names a pressing quality rather than the act; 圧搾 is really pressing or squeezing.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 圧縮あっしゅくcompression
• コンプレッションcompression
• 着圧ちゃくあつcompression (caused by tight-fitting clothing, e.g. compression socks)
• 圧迫性あっぱくせいcompression
• 圧搾あっさくpressure