Using a particular proportion of available energy.
Origin of Efficient
1398, "making," from Old French, from Latin efficientem (nominative efficiens), preposition of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from 1787. Efficiency apartment is first recorded 1930, American English.
Middle English from Old French from Latin efficiēns efficient- present participle of efficere to effect effect
From American Heritage Dictionary of the English Language, 5th Edition
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