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\u201d ( Flora Lewis). To spread the rumor or report of. To talk much or volubly. To be noisy; make noise.