Motion

Motion, mō′shun, n. the act or state of moving: a single movement: change of posture: gait: power of moving or of being moved: angular velocity—direct when from west to east; retrograde when from east to west: excitement of the mind: any natural impulse, instigation: proposal made, esp. in an assembly: an application to a court, during a case before it, for an order or rule that something be done, esp. something incidental to the progress of the cause rather than its issue: evacuation of the intestine: (pl., B.) impulses.—v.i. to make a significant movement, to offer a proposal.—v.t. to guide by a gesture, &c.: to move.—adj. Mō′tile, capable of spontaneous motion.—n. Motil′ity.—adj. Mo′tional, characterised by motions.—n. Mō′tionist, one who makes a motion.—adj. Mō′tionless, without motion.—Absolute motion, change of absolute place; Accelerated motion, motion of which the velocity is continually increasing; Angular motion, motion regarded as measured by the increase of the angle made with some standard direction by a line drawn from the moving object to a fixed point; Laws of motion, Newton's three laws: (1) Every body continues in its state of rest, or of uniform motion in a straight line, except so far as it may be compelled by force to change that state; (2) Change of motion is proportional to force applied, and takes place in the direction of the straight line in which the force acts; (3) To every action there is always an equal and contrary reaction; Parallel motion (see Parallel); Perpetual motion (see Perpetual); Quantity of motion, momentum. [Fr.,—L.,—movēre, mōtum, to move.]