効

Meaning

効 centers on the idea of producing a desired result: something that works well, has merit, or brings a benefit. The meanings of efficacy and efficiency are natural extensions of this core idea of effectiveness.

• 効果こうか
  N3

  effect; effectiveness; efficacy; result

• 有効ゆうこう
  N2

  valid; effective

• 効率こうりつ
  N2

  efficiency

• 効くきく
  N3

  to be effective; to take effect; to be good (for)

• 無効むこう
  N1

  invalid; void; ineffective; unavailable

• 効こう

  efficacy; benefit; efficiency; effect; result; success

• 効力こうりょく
  N2

  effect; efficacy; validity; potency

• 即効そっこう

  immediate effect; instant effect

• 時効じこう
  N1

  statute of limitations; lapse of rights after a period of time; prescription (including acquisitive and extinctive prescription)

• 実効じっこう

  practical effect; efficacy; efficiency

• 効能こうのう

  effect; effectiveness; efficacy; virtue; benefit

• 効き目ききめ
  N1

  effect; virtue; efficacy; impression

• 失効しっこう

  lapse; abatement; invalidation; expiration; expiry; becoming void

• 発効はっこう

  coming into effect

• 効用こうよう

  use; utility; effect; benefit

• 薬効やっこう

  medical efficacy; effect of a medicine

• 特効薬とっこうやく

  specific medicine; wonder drug; silver bullet

• 特効とっこう

  striking effect (e.g. of a remedy); dramatic results; special effect; particular efficacy

• 速効そっこう

  speedy effect

• 遅効ちこう

  delayed effect

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