/ Dictionary / Index L longtime: Meaning and Definition of Find definitions for: long•time Pronunciation: (lông'tīm", long'-), [key] — adj. existing, occurring, or continuing for a long period of time; longstanding: longtime friends celebrating 50 years of association. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: longtime (Thesaurus) long-term memory long tom Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language