Definition of efficient adjective from the Oxford Advanced Learner's Dictionary

Oxford3000

efficient

adjective
ɪˈfɪʃnt
 
; ɪˈfɪʃnt
 
 
doing something well and thoroughly with no waste of time, money, or energy
an efficient secretaryefficient heating equipmentthe efficient use of energyWe offer a fast, friendly and efficient service.As we get older, our bodies become less efficient at burning up calories.fuel-efficient cars (= that do not use much fuel)
Opposite
inefficient
efficiently
ɪˈfɪʃntli
 
; ɪˈfɪʃntli
 
adverba very efficiently organized event