(v. a.P. a.adv.) : lībro, āvi, ātum, 1, v. a.libra.
* To balance, make even, level, to determine a level: aquam, to level water, i. e. to ascertain the fall of water by means of a level, Vitr. 8, 6, 3: collocationem libratam indicare, id 8, 6, 1.—Pass. impers.: libratur autem dioptris,Vitr. 8, 6, 1.
* Transf., to make even or level: pavimenta,Cato, R. R. 18, 7.
* To hold in equilibrium, to poise, balance: terra librata ponderibus,Cic. Tusc. 5, 24, 69: columnarum turbines ita librati perpenderunt, ut puero circumagente tornarentur,Plin. 36, 13, 19, § 91: librati pondera caeli orbe tene medio,Luc. 1, 58.
* To cause to hang or swing, to keep suspended, keep in its place: vela cadunt primo et dubia librantur ab aura,are waved to and fro,Ov. F. 3, 585: et fluctus supra, vento librante, pependit,Sil. 17, 274: aëris vi suspensam librari medio spatio tellurem,Plin. 2, 5, 4, § 10.
* Trop.
* To make of even weight, to balance, make equal (poet.): orbem horis,Col. 10, 42: crimina in antithetis,Pers. 1, 85.
* To weigh, ponder, consider (poet. and in post-class. prose): librabat metus,Stat. Th. 9, 165: quae omnia meritorum momenta perpendit, librat, examinat, Naz. Pan. ad Const. 7: praescriptiones, Cod. Th. 8, 4, 26.— Hence, lībrātus, a, um, P. a.
* Level, horizontal: aquam non esse libratam, sed sphaeroides habere schema,Vitr. 8, 6.
* Poised, balanced, swung, hurled, launched; forcible, powerful: librata cum sederit (glans),Liv. 38, 29: librato magis et certo ictu,violent, powerful,Tac. H. 2, 22: malleus dextra libratus ab aure,Ov. M. 2, 624: per nubes aquila librata volatu,Sil. 15, 429. —Comp.: libratior ictus,Liv. 30, 10; cf. id. 42, 65.—Hence, * adv.: lībrātē, deliberately: aliquid eligere,Serv. Verg. A. 2, 713.

s. TLL