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The term :


 in metaphysics it refers to different things depending on the writer. In some instances it refers to a process that occurs prior to evolution and gives rise to the 


, in others an aspect of 


, and still others a process that follows the completion of evolution in the human form.


In mathematics, an (anti-)involution, or an involutary function, is a function f that is its own inverse:

f(f(x)) = x for all x in the domain of f.

Involution of an organ is the shrinking or return to a former size.


In biology, involution is the process by which the uterus is transformed from pregnant to non-pregnant state.