plication

noun

1. (countable, uncountable)An act of folding.
2. (countable, uncountable)A fold or pleat.

   “But the recognition of nappes set out the research project: you need not simply throw up your hands in despair at perverse plications and ceaseless crenelations in the Alps.”

3. (countable, uncountable)A surgical procedure in which a body part is strengthened or shortened by pulling together folds of excess material, and suturing them into place.