involution: Meaning and Definition of

in•vo•lu•tion

1. an act or instance of involving or entangling; involvement.
2. the state of being involved.
3. something complicated.
1. a rolling up or folding in upon itself.
2. a part so formed.
5. retrograde development; degeneration.
6. the regressive changes in the body occurring with old age.
7. a complex construction in which the subject is separated from its predicate by intervening clauses or phrases.
8. a function that is its own inverse.