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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.
noun. Perturbation is an anxiety or disturbance, or is a cause of disturbance, or a from what is normal, especially when the deviation is caused by an outside influence. 1  When you are feeling anxious about something you are required to do but don't like do, this is an example ofperturbation.