Noun

(en-noun)

The act of involving, or the state of being involved.

*{{quote-news, year=1988, date=July 8, author=, title=Portfolio Without Artist, work=Chicago Reader citation

, passage=His colorful life span might be regarded as the story of an adventurer rather than that of an artist; despite his lengthy involvements in many of the arts--painting, fiction, theater, and film--one often feels from his autobiography that it was the adventures that counted most for him. }}

Noun

(en noun)

entanglement; a spiralling inwards; intricacy

:* 1968': ‘Gomez,’ said the mortician, ‘is an expert only on the '''involutions of his own rectum.’ — Anthony Burgess, ''Enderby Outside

(mathematics) An endofunction whose square is equal to the identity function; a function equal to its inverse.

* 1996 , Alfred J. Menezes et al, Handbook of Applied Cryptography , CRC Press, page 10:

Involutions have the property that they are their own inverses.

(physiology) The regressive changes in the body occurring with old age.

(mathematics, obsolete) A power: the result of raising one number to the power of another.