| 1. something which separates, leach; program which receives output from another program and changes its format (Computers); file which allows a program to save and load files of a certain file type (Computers). pass a liquid or gas through porous material to remove impurities, strain; slowly pass in or out; partially block the passage of; send through a filter. filterfilter, v. t. [imp. & p. p. filtered ; p. pr. & vb. n. filtering] [cf. f. filter. see: filter, n., and cf. filtrate.] to purify or defecate, as water or other liquid, by causing it to pass through a filter |