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Webster 1913 Edition

Noun.

A folding or fold; a plait.

Richardson.

Noun.

[from L. plico.] A folding or fold.

plication ‎(plural plications)

(now chiefly biology, geology) An act of folding. [from 15th c.]
(now chiefly biology, geology) A fold or pleat. [from 18th c.]
- 2004, Richard Fortey, The Earth, Folio Society 2011, p. 96:
  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.
(medicine) A surgical procedure in which a body part is strengthened or shortened by pulling together folds of excess material, and suturing them into place. [from 20th c.]