Entry 3 senses · 3 variants Webster, 1913 Plein /plēn/ · IPA /plˈiːn/ a. v. i. & t. a. 01 a. Plan. 1. Plan.[Obs.] 02 v. i. & t. To complain. See Plain. 1. To complain. See Plain.[Obs.] See: Plain 03 a. Full; complete. 1. Full; complete.[Obs.]