| 効 | meaning | 'merit, efficacy, efficiency, benefit' |
| onyomi | コウ | |
| kunyomi | き.く, ききめ, なら.う |
| term | pronunciation | English |
|---|---|---|
| 効力 | こうりょく | effect, efficacy, validity, potency |
| 有効 | ゆうこう | validity, availability, effectiveness |
| 効果 | こうか | effect, effectiveness, efficacy, result |
| 効果的 | こうかてき | effective, successful |
| 効率 | こうりつ | efficiency, efficacy, performance, utility factor |
| 効率的 | こうりつてき | efficient |
| 即効 | そっこう | immediate effect, instant effect |
| 実効 | じっこう | practical effect, efficacy, efficiency |
| 無効 | むこう | invalid, no effect, unavailable, illegal |
| 発効 | はっこう | coming into effect |
| 逆効果 | ぎゃくこうか, ぎゃっこうか | backfire, counterproductive, opposite effect |
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