Involution

Involution occurs when something turns in upon itself. It may refer to:

Involute, a construction in the differential geometry of curves
Involution (agriculture), intensification of production through increased labour inputs
Involution (mathematics), a function that is its own inverse
Involution (medicine), the shrinking of an organ (such as the uterus after pregnancy)
Involution (philosophy), a "turning in" on one's self
Involution (esoterism), several notions of a counterpart to evolution
Involution (Meher Baba), the inner path of the human soul to the self

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