The act of disturbing: a disturbance of lake sediments. The condition of being disturbed:"The forest .. is in various stages of disturbance. Only the biggest trees .. have been left standing"(Alex Shoumatoff). Something that disturbs, as a commotion, scuffle, or public tumult. Mental or emotional unbalance or disorder. A variation in normal wind conditions. Geology Folding or faulting that affects a relatively large area. Physics An alteration or displacement of a region of a medium from its equilibrium state.