Sound or a sound that is loud, unpleasant, unexpected, or undesired.
Sound or a sound of any kind: The only noise was the wind in the pines.
A loud outcry or commotion: the noise of the mob; a lot of noise over the new law.
Physics A disturbance, especially a random and persistent disturbance, that obscures or reduces the clarity of a signal.
Computer Science Irrelevant or meaningless data.
Informal A complaint or protest.
Informal Rumor; talk.
Informal Remarks or actions intended to convey a specific impression or to attract attention: "The U.S. is making appropriately friendly noises to the new Socialist Government” ( Flora Lewis).