(n): a process occurring in living organisms
(n): a long and intricate and complicated grammatical construction
(n): a group of words that form a constituent of a sentence and are considered as a single unit
(n): marked by elaborately complex detail
(n): the quality of being intricate and compounded
(n): the act of sharing in the activities of a group
(n): action taken by a group of people
(n): the process of raising a quantity to some assigned power
(n): (mathematics) calculation by mathematical methods
(n): the action of enfolding something
(n): an action that changes the shape of something
...only think of the gigantic involutions of his intestines, where they lie in him like great cables and hawsers coiled away in the subterranean orlop-deck of a line-of-battle-ship.
- Melville, Moby-Dick, ch. 104