Etymology
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corrugation (n.)

1520s, "act of corrugating," from Latin *corrugationem(nominative corrugatio), noun of action from past-participle stem of corrugare (see corrugate). Meaning "a wrinkling, contraction into wrinkles" is by 1829.

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Definitions of corrugation

corrugation (n.)
a ridge on a corrugated surface;
corrugation (n.)
the act of shaping into parallel ridges and grooves;
From wordnet.princeton.edu