/ Dictionary / Index L lunation: Meaning and Definition of Find definitions for: lu•na•tion Pronunciation: (l-nā'shun), [key] — n. the period of time from one new moon to the next (about 29 days); a lunar month. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lunation (Thesaurus) lunatic fringe lunch Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language