Entry 1 sense Webster, 1913 Piratical · Pi·rat·ic·al · IPA /paɪˈɹætɪkɘl/ 01 a. Of or pertaining to a pirate; acquired by, or practicing, piracy; as, a piratical undertaking. 1. Of or pertaining to a pirate; acquired by, or practicing, piracy; as, a piratical undertaking.