Etymology

efficient

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Today it means: Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy. Full definition →

Latin efficientem
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The story

  1. Latin · derived fromefficientem
  2. English todayefficient

1398, “making,” from Old French, from Latin efficientem, nominative efficiēns, participle of efficere (“work out, accomplish”) (see effect). Meaning “productive, skilled” is from 1787. Efficiency apartment is first recorded 1930, American English.

Etymology from Wiktionary, CC BY-SA 4.0.