vibration

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of vibrating.
• noun The condition of being vibrated.
• noun A rapid linear motion of a particle or of an elastic solid about an equilibrium position.
• noun A periodic process.
• noun A single complete vibrating motion; a quiver.
• noun Informal A distinctive emotional quality or atmosphere that is sensed or experienced by someone. Often used in the plural.

from The Century Dictionary.

• noun The act of vibrating; a movement to and fro; oscillation; hence, fluctuation in general: as, avibration of opinion.
• noun 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.
• noun In medicine, same as fremitus.
• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of vibrating, or the state of being vibrated, or in vibratory motion; quick motion to and fro; oscillation, as of a pendulum or musical string.
• noun (Physics) A limited reciprocating motion of a particle of an elastic body or medium in alternately opposite directions from its position of equilibrium, when that equilibrium has been disturbed, as when a stretched cord or other body produces musical notes, or particles of air transmit sounds to the ear. The path of the particle may be in a straight line, in a circular arc, or in any curve whatever.
• noun the maximum displacement of a vibrating particle or body from its position of rest.
• noun any part of the path described by a particle or body in making a complete vibration, in distinction from other parts, as while moving from one extreme to the other, or on one side of the line of rest, in distinction from the opposite. Two particles are said to be in the same phase when they are moving in the same direction and with the same velocity, or in corresponding parts of their paths.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of vibrating or the condition of being vibrated
• noun physics Any periodic process, especially a rapid linear motion of a body about an equilibrium position
• noun A single complete vibrating motion
• noun slang An instinctively sensed emotional aura or atmosphere; vibes

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of vibrating
• noun (physics) a regular periodic variation in value about a mean
• noun a distinctive emotional aura experienced instinctively
• noun a shaky motion