Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: , present participle of efficere; EFFECT1

efficient

adjective
     
ef‧fi‧cient S2 W3
if someone or something is efficient, they work well without wasting time, money, or energy [≠ inefficient]:
a very efficient secretary
an efficient use of land
Lighting is now more energy efficient.
efficiently adverb

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