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効率的 / こうりつてき : 1）effective 2）effectively 3）efficient 4）efficiently (an)
効果的 / こうかてき : adj-na 1）effective 2）successful P
効率 / こうりつ : n 1）efficiency 2）efficacy 3）performance 4）utility factor P
効率化 / こうりつか : n vs 1）making efficient 2）optimization
効率性 / こうりつせい : n 1）efficiency
効き / きき : n 1）effectiveness 2）efficacy 3）efficaciousness
効 / かい / こう : n 1）effect 2）result 3）worth 4）use 5）avail n 6）efficacy 7）benefit 8）efficiency 9）effect 10）success
効力 / こうりょく : n 1）effect 2）efficacy 3）validity 4）potency P
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効率的

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