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involution

C2
noun

Pronunciation

UK

  • /ɪnvəlˈuːʃən/

US

  • /ɪnvəlˈuːʃən/

Description

Imagine a winding path that folds back on itself. That gives you the feel of this word. It can describe something becoming more and more complicated, with parts twisted together in a way that is hard to sort out. You might see it used for family relationships, a detailed system, or a line of thought that keeps turning inward and growing more layered. Sometimes it also keeps its more literal sense of an inward folding or curling.

The word comes from a Latin idea meaning "rolling up" or "enfolding." It is not always negative. At times, it suggests rich complexity rather than simple confusion. In biology, it can also describe an organ shrinking back to its earlier or normal size after it has served its purpose. In mathematics, it names a function or operation that returns to the starting point when you apply it twice.

Examples

  1. 1

    Childbirth recovery

    After childbirth, the uterus begins its involution over the next several weeks.

  2. 2

    Aging anatomy

    The paper describes the age-related involution of the thymus.

    • Domain

      in biology or medicine, age-related involution

      gradual shrinking or weakening with age

  3. 3

    Mathematics

    The map is an involution: if you apply it twice, you return to the starting point.

    • Domain

      in mathematics, an involution is something that undoes itself when used twice

  4. 4

    Character decline

    The novel follows the involution of a confident leader into a lonely, suspicious man.

    • Pattern

      involution of A into B

      a formal way to describe a gradual inward or negative change

Forms and spellings

1 form open this card.

Main spelling

  • involutionnoun