lībrātĭo, ōnis, f. [libro]. I.A making level, levelling: fortasse qui Archimedis libros legit, dicet non posse fieri veram ex aqua librationem, Vitr. 8, 6, 3.—II.A horizontal position, level: circa terrae librationem, Vitr. 6, 1, 5.—III.A hurling off, hurling, slinging, Diom. p. 473 P.