Entry 1 sense Webster, 1913 Corrugation /(k?r`r?-g?"sh?n)/ · Cor·ru·ga·tion · IPA /ˌkɔɹ.əˈɡeɪ.ʃən/ 01 n. The act corrugating; contraction into wrinkles or alternate ridges and grooves. 1. The act corrugating; contraction into wrinkles or alternate ridges and grooves.