Libration of the moon, any one of those small periodical changes in the position of the moon's surface relatively to the earth, in consequence of which narrow portions at opposite limbs become visible or invisible alternately. It receives different names according to the manner in which it takes place; as: (a) Libration in longitude, that which, depending on the place of the moon in its elliptic orbit, causes small portions near the eastern and western borders alternately to appear and disappear each month. (b) Libration in latitude, that which depends on the varying position of the moon's axis in respect to the spectator, causing the alternate appearance and disappearance of either pole. (c) Diurnal or parallactic libration, that which brings into view on the upper limb, at rising and setting, some parts not in the average visible hemisphere.

(Li"bra*to*ry) a. Balancing; moving like a balance, as it tends to an equipoise or level.

(Li*bid"i*nous) a. [L. libidinosus, fr. libido, libidinis, pleasure, desire, lust, fr. libet, lubet, it pleases: cf. F. libidineux. See Lief.] Having lustful desires; characterized by lewdness; sensual; lascivious.Li*bid"i*nous*ly, adv.Li*bid"i*nous*ness, n.

Syn. — Lewd; lustful; lascivious; unchaste; impure; sensual; licentious; lecherous; salacious.

(Lib"ken Lib"kin) n. [AS. libban, E. live, v. i. + -kin.] A house or lodging. [Old Slang] B. Jonson.

(||Li"bra) n.; pl. Libræ [L., a balance.] (Astron.) (a) The Balance; the seventh sign in the zodiac, which the sun enters at the autumnal equinox in September, marked thus &libra in almanacs, etc. (b ) A southern constellation between Virgo and Scorpio.

(Li"bral) a. [L. libralis, fr. libra the Roman pound.] Of a pound weight. [Obs.] Johnson.

(Li*bra"ri*an) n. [See Library.]

1. One who has the care or charge of a library.

2. One who copies manuscript books. [Obs.] Broome.

(Li*bra"ri*an*ship), n. The office of a librarian.

(Li"bra*ry) n.; pl. Libraries (- riz). [OE. librairie, F. librairie bookseller's shop, book trade, formerly, a library, fr. libraire bookseller, L. librarius, from liber book; cf. libraria bookseller's shop, librarium bookcase, It. libreria. See Libel.]

1. A considerable collection of books kept for use, and not as merchandise; as, a private library; a public library.

2. A building or apartment appropriated for holding such a collection of books. Holland.

(Li"brate) v. i. [imp. & p. p. Librated (li"bra*ted); p. pr. & vb. n. Librating.] [L. libratus, p. p. of librare to balance, to make even, fr. libra. 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.

(Li"brate), v. t. To poise; to balance.

(Li*bra"tion) n. [L. libratio: cf. F. libration.]

1. The act or state of librating. Jer. Taylor.

2. (Astron.) A real or apparent libratory motion, like that of a balance before coming to rest.

  By PanEris using Melati.

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