実効 じっこう Meanings Noun practical effect; efficacy; efficiency Kanji 実 real. Read as ジツ. 効 effect. Read as コウ. Words containing 実効 実効支配 (じっこうしはい) effective control (over territory) 実効性 (じっこうせい) effectiveness 実効値 (じっこうち) root mean squared value And 11 more. Jinuma: Japanese Dictionary · Word lists