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1. Designed to reduce environmental noise, as in a community: an antinoise ordinance.
2. Capable of neutralizing the sound of another noise.
A technique for neutralizing unwanted sound, in which a second sound wave, identical to but out of phase with the unwanted sound, is used to cancel the unwanted sound.
(General Engineering) sound generated so that it is out of phase with a noise, such as that made by an engine, in order to reduce the noise level by interference
an•ti•noise(ˌæn tiˈnɔɪz, ˌæn taɪ-)
designed to reduce or ban excessively loud sound, as of jet engines or traffic: antinoise regulations.