5. Grammar an involved construction, esp. one created by a clause interposed between a subject and its predicate
6. Ancient Mathematics the raising of a quantity to any given power
a. the return of an organ to its normal size after distention, as of the womb after childbirth
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'involution'L involutio < involutus, pp. of involvere