Oscillating engine, a steam engine whose cylinder oscillates on trunnions instead of being permanently fixed in a perpendicular or other direction. Weale.

(Os`cil*la"tion) n. [L. oscillatio a swinging.]

1. The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.

2. Fluctuation; variation; change back and forth.

His mind oscillated, undoubtedly; but the extreme points of the oscillation were not very remote.

Axis of oscillation, Center of oscillation. See under Axis, and Center.

(Os"cil*la*tive) a. Tending to oscillate; vibratory. [R.] I. Taylor.

(||Os`cil*la*to"ri*a) n. pl. [NL. See Oscillatory.] (Bot.) Same as Oscillaria.

(Os"cil*la*to*ry) a. [Cf. F. oscillatoire. See Oscillate.] Moving, or characterized by motion, backward and forward like a pendulum; swinging; oscillating; vibratory; as, oscillatory motion.

(Os"cine) a. (Zoöl.) Relating to the Oscines.

Osage orange
(O"sage or"ange) (Bot.) An ornamental tree of the genus Maclura closely allied to the mulberry (Morus); also, its fruit. The tree was first found in the country of the Osage Indians, and bears a hard and inedible fruit of an orangelike appearance. See Bois d'arc.

(O*sa"ges) n. pl.; sing. Osage (Ethnol.) A tribe of southern Sioux Indians, now living in the Indian Territory.

(O*san"ne) n. Hosanna. [Obs.] Chaucer.

(O"sar) n. pl. (Geol.) See 3d Os.

(Os"can) a. Of or pertaining to the Osci, a primitive people of Campania, a province of ancient Italy.n. The language of the Osci.

(Os"cil*lan*cy) n. The state of oscillating; a seesaw kind of motion. [R.]

(||Os`cil*la"ri*a) n. [NL., fr. L. oscillare to swing.] (Bot.) A genus of dark green, or purplish black, filamentous, fresh-water algæ, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

(Os"cil*late) v. i. [imp. & p. p. Oscillated ; p. pr. & vb. n. Oscillating ] [L. oscillare to swing, fr. oscillum a swing, a little mask or puppet made to be hung from trees and swing in the wind, prob. orig., a little mouth, a dim. from os mouth. See Oral, and cf. Osculate.]

1. To move backward and forward; to vibrate like a pendulum; to swing; to sway.

2. To vary or fluctuate between fixed limits; to act or move in a fickle or fluctuating manner; to change repeatedly, back and forth.

The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits.
Dc Quincey.

(Os"cil*la`ting) a. That oscillates; vibrating; swinging.

  By PanEris using Melati.

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