• 効率こうりつ

  efficiency

• 効用こうよう

  use, utility, effect, benefit

• 効力こうりょく

  effect, efficacy, validity, potency

• 効能こうのう

  effect, effectiveness, efficacy, virtue, benefit

• 効果こうか

  effect, effectiveness, efficacy, result

• 効くきく

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

• 発効はっこう

  coming into effect

• 時効じこう

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

• 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, void, ineffective, unavailable

• 有効ゆうこう

  valid, effective

• 効率的こうりつてき

  efficient

• 効果的こうかてき

  effective, successful

• 効き目ききめ

  effect, virtue, efficacy, impression

• 特効薬とっこうやく

  specific medicine, wonder drug, silver bullet

• 逆効果ぎゃくこうか

  opposite effect, adverse effect, backfiring

• 効こう

  efficacy, benefit, efficiency, effect, result, success

• 効験こうけん

  efficacy, effect

• 卓効たっこう

  great efficiency

• 薬効やっこう

  medical efficacy, effect of a medicine

• 遅効ちこう

  delayed effect

• 速効そっこう

  speedy effect

• 奏効そうこう

  efficacy

• 偉効いこう

  great effect

• 治効ちこう

  treatment efficacy

• 肥効ひこう

  fertilizer response, effect of fertilizer

• 残効ざんこう

  aftereffect

• 余効よこう

  aftereffect, after effect

• 失効しっこう

  lapse, abatement, invalidation, expiration, expiry, becoming void

• 奇効きこう

  remarkable effect

• 特効とっこう

  (having) striking effects, (producing) dramatic results, of particular efficacy

• 効果音こうかおん

  sound effect

• 効率性こうりつせい

  efficiency

• 効率化こうりつか

  making efficient, optimization

• 薬効物やっこうぶつ

  medically effective ingredient

• 失効日しっこうび

  expiry date, date of expiry

• 実効値じっこうち

  root mean squared value

• 実効長じっこうちょう

  effective length

• 網効率もうこうりつ

  network efficiency

• 有効化ゆうこうか

  activation, enabling, validation

• 無効票むこうひょう

  spoilt vote, faulty ballot

• 対世効たいせいこう

  binding legal effectiveness as to third parties

• 発効日はっこうび

  effective date

• 有効打ゆうこうだ

  telling blow

• 熱効率ねつこうりつ

  thermal efficiency

• 有効域ゆうこういき

  scoping unit

• 擬有効ぎゆうこう

  pseudoeffective

• 有効性ゆうこうせい

  validity, effectiveness

• 即効薬そっこうやく

  quick-acting remedy, fast-acting medicine