/ Dictionary / Index P prolongate: Meaning and Definition of Find definitions for: pro•lon•gate Pronunciation: (pru-lông'gāt, -long'-), [key] — -gat•ed, -gat•ing. to prolong. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prolong prolongation Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language