n. 1 the process of involving. 2 an entanglement. 3 intricacy. 4 curling inwards. 5 a part that curls upwards. 6 Math. the raising of a quantity to any power. 7 Physiol. the reduction in size of an organ in old age, or when its purpose has been fulfilled (esp. the uterus after childbirth). involutional adj.
[ L involutio (as INVOLVE) ]