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The Collaborative International Dictionary of English v.0.48 (gcide)

Involution \In`vo*lu"tion\, n. [L. involutio: cf. F. involution.
See {Involve}.]
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1. The act of involving or infolding.
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2. The state of being entangled or involved; complication;
entanglement.
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All things are mixed, and causes blended, by mutual
involutions. --Glanvill.
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3. That in which anything is involved, folded, or wrapped;
envelope. --Sir T. Browne.
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4. (Gram.) The insertion of one or more clauses between the
subject and the verb, in a way that involves or
complicates the construction.
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5. (Math.) 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.
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6. (Geom.) 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.
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7. (Med.) The return of an enlarged part or organ to its
normal size, as of the uterus after pregnancy.
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