| Readings | On-reading | こう |
| Kun-reading | きく | |
| Meaning | to effect / efficacy | |
| Radical | 力 | |
| Stroke count | ８ | |
| JLPT Level | N2 | |
Stroke order of 「効」
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Vocabulary contains 「効」
| Word | Meaning |
| 効く（きく） | to be effective |
| 効果（こうか） | effectiveness |
| 効率（こうりつ） | efficiency |
