/ Dictionary / Index L libratory: Meaning and Definition of Find definitions for: li•bra•to•ry Pronunciation: (lī'bru-tôr"ē, -tōr"ē), [key] — adj. oscillatory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. libration librettist 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