/ Dictionary / Index F fictitious force: Meaning and Definition of Find definitions for: ficti'tious force' Pronunciation: [key] — Physics. Physics. any force that is postulated to account for apparent deviations from Newton's laws of motion appearing in an accelerated reference system. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fictitious fictitious person Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language