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語源 1

First attested in 1623; borrowed from Latin lībrātus, perfect passive participle of lībrō (see -ate (verb-forming suffix)), from lībra (“a balance”).

動詞

librate (third-person singular simple present librates, present participle librating, simple past and past participle librated)

1. (intransitive) To oscillate (like the beam of a balance).
   • 1796, William Cliffton, The Group:

     Their parts all librate on too nice a beam.

   • 2002 October 18, S. J. Peale, Man Hoi Lee, “A Primordial Origin of the Laplace Relation Among the Galilean Satellites”, in Science, volume 298, number 5593, →DOI, page 594:

     The currently observed orbital resonances at the 2:1 mean motion commensurabilities involving Io-Europa and Europa-Ganymede are such that the resonance variables ${\displaystyle \theta _{1}=\lambda _{1}-2\lambda _{2}+\omega _{1}}$ and ${\displaystyle \theta _{3}=\lambda _{2}-2\lambda _{3}+\omega _{2}}$ librate about 0° and ${\displaystyle \theta _{2}=\lambda _{1}-2\lambda _{2}+\omega _{2}}$ librates about 180°, all with small amplitude.

2. (intransitive, figuratively) To waver or deliberate between two opposing thoughts or choices.
   • 1924, Herbert Weir Smyth, “VI. Orestea. I: Agamemnon”, in Aeschylean Tragedy, page 168:

     But she winds about him coil after coil of her glittering rhetoric, in which reason holds its own as it librates with specious feeling.

3. (intransitive) To be poised; to balance oneself.
   • 1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, page 138:

     Her playful Sea-horse […] His watery way with waving volutes wins, / Or listening librates on unmoving fins.

4. (obsolete, transitive) To place in a balance; to weigh.

関連する語

• libration

語源 2

From Medieval Latin lībrāta, from Latin lībra (“pound”).

名詞

librate (plural librates)

1. (now historical) A piece of land having a value of one pound per year.

参照

• John A. Simpson and Edmund S. C. Weiner, editors (1989), “librate”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, →ISBN.

アナグラム

• altbier, betrail, tablier, triable, trilabe

参照

• “librate”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press