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.