/ Dictionary / Index P prolongation: Meaning and Definition of Find definitions for: pro•lon•ga•tion Pronunciation: (prō"lông-gā'shun, -long-), [key] — n. the act of prolonging: the prolongation of a line. the state of being prolonged. a prolonged or extended form. an added part. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prolongation (Thesaurus) prolongate prolonge Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language