/ Dictionary / Index L libration: Meaning and Definition of Find definitions for: li•bra•tion Pronunciation: (lī-brā'shun), [key] — n. Astron. a real or apparent oscillatory motion, esp. of the moon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: libration (Thesaurus) librate libratory Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language