実効|じっこうjikkou[0]heiban (flat)

1. nounpractical effect; efficacy; efficiency

• Synonym効果こうかNeutralThe all-purpose word for effect, as in 「効果がある」; 「実効」 stresses that something actually takes effect.
• Synonym効力こうりょくWrittenWritten/formal; validity or potency, of drugs and law alike, as in 「効力を失う」; 「実効」 stresses actual effectiveness.
• Synonym効能こうのうWrittenWritten/formal; the beneficial effects of medicines, hot springs and the like, as in 「温泉の効能」; 「実効」 stresses actual effectiveness.
• Synonym効き目ききめNeutralMedicinal or therapeutic effect, as in 「薬の効き目」; stresses the effect actually showing.
• Related効こうNeutralEfficacy or benefit; mostly in set phrases such as 「効を奏する」, and rare on its own.
• Related甲斐かいCasualColloquial; the worth or payoff that makes an act worthwhile, as in 「努力した甲斐があって合格した」. 「実効」 is the effect actually in force.
• Related利きききCasualColloquial; effectiveness or dominance, as in 「利き手」 and 「効きが悪い」; 「実効」 is the more written, formal term.
• Related効験こうけんWrittenWritten/formal; efficacy or virtue, for medicines and prayers alike; 「実効」 stresses actual effectiveness.
• Antonym名目めいもくWrittenWritten/formal; what something is called in name, as against 「実効」, the effect actually achieved.

Use 「実効」 for effect actually in force, as in 「実効性」, 「実効支配」 and 「実効税率」. For effects in general say 「効果」, for legal validity 「効力」, and for how well a medicine works 「効き目」; the contrast is 「名目」, in name only.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 実際じっさいの効力こうりょくや効果こうか。