Webster's English Dictionary

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vibration

vi.bra.tion \vi--'bra--sh*n\ \-shn*l, -sh*n-*l\ \-sh*n-l*s\ n 1a: a 
   periodic motion of the particles of an elastic body or medium in alte 
   rnately opposite directions from the position of equilibrium when that 
   equilibrium has been disturbed (as when a stretched cord produces musical 
   tones or particles of air transmit sounds to the ear) 1b: the action of 
   vibrating : the state of being vibrated or in vibratory  motion : as 1b1: 
   OSCILLATION  1b2: a quivering or trembling motion : QUIVER  2: an instance 
   of vibration  3: vacillation in opinion or action : WAVERING  - 
   vi.bra.tion.al aj