/ Dictionary / Index F filter factor: Meaning and Definition of Find definitions for: fil'ter fac"tor Pronunciation: [key] — Photog. Photog. a number indicating the increased exposure that a particular film should receive when a photograph is taken using a particular filter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. filter bed filter feeder Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language