POLYGON Meaning of POLYGON in English pol ‧ y ‧ gon /ˈpɒlɪɡən $ ˈpɑːlɪɡɑːn/ BrE AmE noun [countable] technical a flat shape with three or more sides —polygonal /pəˈlɪɡən ə l/ adjective Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012