1. (

• efficient

) being effective without wasting time or effort or expense; "an efficient production manager"; "efficient engines save gas" ;

2. (

• effective ,
• efficient

) 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..."-G.B.Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution" ;