/ Dictionary / Index Y yearlong: Meaning and Definition of Find definitions for: year•long Pronunciation: (yēr'lông', -long'), [key] — adj. lasting for a year. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: yearlong (Thesaurus) yearling yearly Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language