noun

1. an involving or being involved; entanglement
2. anything that is involved; complication; intricacy
3. Anat. the process of rolling or curling inward, as in the formation of a gastrula
4. Biol. a retrograde or degenerative change
5. Gram. an involved construction, esp. one created by a clause interposed between a subject and its predicate
6. Math. the raising of a quantity to any given power
7. Med.
   1. the return of an organ to its normal size after distention, as of the womb after childbirth
   2. a decline in the normal functions of the human body, or of an organ, that occurs with age, as the changes taking place at menopause

Etymology: L involutio < involutus, pp. of involvere