行動半径 こうどうはんけい Meanings Noun radius of action; combat radius sphere of activity; range of activity Kanji 行 go. Read as コウ. 動 move. Read as ドウ. 半 half. Read as ハン. 径 diameter. Read as ケイ. Word lists Military Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists