Dictionary/平面へいめんHeimen平面 (Heimen) is a Japanese noun meaning “level surface, plane”.Meaningsnounlevel surface; planeKanji in 平面平even面maskRelated words面白いinteresting面face面face面face平気cool面倒trouble真面目serious公平fairness面接interview (e.g. for a job)平和peace面倒くさいbothersome面会meeting (face-to-face)