Meaning of “compress” - Learner’s Dictionary

compress

verb [ T ] us uk /kəmˈpres/

to make something smaller, especially by pressing it, so that it uses less space or time:

compressed air
The course compresses / two years' training into six months.

to use a special program to make information on a computer use less space

compression noun [ U ] us uk /kəmˈpreʃən/

(Definition of “compress” from the Cambridge Learner’s Dictionary © Cambridge University Press)