n. The act of vibrating; a movement to and fro; oscillation; hence, fluctuation in general: as, avibration of opinion.n. In physics, an oscillating, reciprocating, or any kind of stationary motion made by a body, as a pendulum, musical cord, elastic plate, or mass of air, when forced from the position, figure, or volume of equilibrium, under the influence of forces of restitution.n. In medicine, same as fremitus.n. In natural history, movement to and fro, especially when quick, continuous, regular, and of little amplitude; a quivering or shivering motion; tremulousness; tremor: as, the vibration of aspen-leaves on their compressed petioles in the breeze; the vibration of the ear-drum under sound-waves; the vibration of a fly's wings in flight.