efficient efficient /ɪˈfɪʃənt/

adjective

1. () Being effective without wasting time, effort or expense  ( efficient )
   being effective without wasting time, effort or expense
    An efficient production manager
   an efficient production manager
    Efficient engines save gas
   efficient engines save gas
   
2. () Able to accomplish a purpose; functioning effectively  ( efficient , effective )
   able to accomplish a purpose; functioning effectively
    People who will do nothing unless they get something out of it for themselves are often highly effective persons...
   people who will do nothing unless they get something out of it for themselves are often highly effective persons...
    Effective personnel
   effective personnel
    An efficient secretary
   an efficient secretary
    The efficient cause of the revolution
   the efficient cause of the revolution