/ Dictionary / Index P postfix: Meaning and Definition of Find definitions for: post•fix Pronunciation: (v.pōst-fiks', pōst'fiksn.pōst'fiks), [key] — v.t. to affix at the end of something; append; suffix. —n. something postfixed. a suffix. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: postfix (Thesaurus) postfeminist post-free Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language