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Freebase(0.00 / 0 votes)Rate this definition: Bioturbation is the reworking of soils and sediments by animals or plants. Its effects include changing texture of sediments, bioirrigation and displacement of microorganisms and non-living particles.
Definition of perturbation. 1  1 : the action of perturbing : the state of being perturbed. 2  2 : a disturbance of motion, course, arrangement, or state of equilibrium; especially : a disturbance of the regular and usually elliptical course of motion of a celestial body that is produced by some force additional to that which causes its regular motion.