Definition of involution

• n. - The act of involving or infolding.
• n. - The state of being entangled or involved; complication; entanglement.
• n. - That in which anything is involved, folded, or wrapped; envelope.
• n. - The insertion of one or more clauses between the subject and the verb, in a way that involves or complicates the construction.
• n. - The act or process of raising a quantity to any power assigned; the multiplication of a quantity into itself a given number of times; -- the reverse of evolution.
• n. - The relation which exists between three or more sets of points, a.a', b.b', c.c', so related to a point O on the line, that the product Oa.Oa' = Ob.Ob' = Oc.Oc' is constant. Sets of lines or surfaces possessing corresponding properties may be in involution.
• n. - The return of an enlarged part or organ to its normal size, as of the uterus after pregnancy.