vibration

1a :  a periodic motion of the particles of an elastic body or medium in alternately opposite directions from the position of equilibrium when that equilibrium has been disturbed (as when a stretched cord produces musical tones or molecules in the air transmit sounds to the ear)b :  the action of vibrating :  the state of being vibrated or in vibratory motion: such as (1) :  oscillation (2) :  a quivering or trembling motion :  quiver

2 :  an instance of vibration

3 :  vacillation in opinion or action :  wavering

4a :  a characteristic emanation, aura, or spirit that infuses or vitalizes someone or something and that can be instinctively sensed or experienced —often used in pluralb :  a distinctive usually emotional atmosphere capable of being sensed —usually used in plural