The Collaborative International Dictionary
Librate \Li"brate\ (l[imac]"br[=a]t), v. i. [imp. & p. p. Librated (l[imac]"br[asl]*t[e^]d); p. pr. & vb. n. Librating.] [L. libratus, p. p. of librare to balance, to make even, fr. libr
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.
vb. (present participle of librate English)
Usage examples of "librating".
Then, opening his eyes, he beheld betwixt himself and the sun, librating on spread wings, that various-colored glory of plumes and feathers which he knew as the gazolba.
Such measurements, performed over a period of years, reveal the Moon to be librating, or quivering with a period (about three years) and amplitude (about three meters), consistent with the idea that the crater Giordano Bruno was gouged out less than a thousand years ago.