involution

/ษชnvษ™หˆluหสƒษ™n/
noun
  1. 1

    Entanglement; a spiralling inwards; intricacy.

  2. 2

    A complicated grammatical construction.

  3. 3

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

  4. 4

    The shrinking of an organ (such as the uterus) to a former size.

  5. 5

    The regressive changes in the body occurring with old age.

  6. 6

    A power: the result of raising one number to the power of another.

Source: https://en.wiktionary.org/wiki/involution