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vi·bra·tion

vibration

 
pronunciation:
vaI breI shn
part of speech: noun
definition: Vibration is the action of vibrating. When something vibrates, it moves back and forth very quickly and very steadily. The movement back and forth is usually very small. Often you can't even see it moving, but you might be able to feel it or hear the sound it creates.
If you look closely at a violin string when it's being played, you can see its vibration.The music was so loud that you could feel the vibration in the floor.
derivation: vibrational (adj.)