compression

/kəm-ˈpre-shən/

noun

  1. the act, process, or result of compressing

  2. the state of being compressed

  3. the process of compressing the fuel mixture in a cylinder of an internal combustion engine (as in an automobile)

noun

  1. a longitudinal wave (such as a sound wave) propagated by the elastic compression of the medium —called also compression wave