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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.
perturbation in Science. A small change in a physical system, most often in a physical system at equilibrium that is disturbed from the outside. Variation in a designated orbit, as of a planet, that results from the influence of one or more external bodies.