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verb (used without object), li·brat·ed, li·brat·ing.
  1. to oscillate or move from side to side or between two points.
  2. to remain poised or balanced.

Origin of librate

1615–25; < Latin lībrātus past participle of lībrāre. to balance, make level, bring to equilibrium. See Libra, -ate1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for librate


verb (intr)
  1. to oscillate or waver
  2. to hover or be balanced
Derived Formslibratory (ˈlaɪbrətərɪ, -trɪ), adjective

Word Origin for librate

C17: back formation from libration
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012