Webster’s Revised Unabridged Dictionary · 1913
Librate
Li′brate (lī′brāt), v. i. [imp. & p. p. Librated (lī′brā·tĕd); p. pr. & vb. n. Librating.] [L. libratus, p. p. of librare to balance, to make even, fr. libra. Cf. Level, Deliberate, Equilibrium.] To vibrate as a balance does before resting in equilibrium; hence, to be poised.
Their parts all librate on too nice a beam. Clifton.
Li′brate, v. t. To poise; to balance.