JMdict: 1319980

失効 【しっこう】

  1. [n,vs,vi] lapse; abatement; invalidation; expiration; expiry; becoming void
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
失 Lose, Error, Fault, Disadvantage, Loss シツ うしな.う, う.せる 4
効 Merit, Efficacy, Efficiency, Benefit コウ き.く, ききめ, なら.う 5