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English to English adjective 1. being effective without wasting time or effort or expense  an efficient production manager|efficient engines save gas source: wordnet30
2. Causing effects; producing results; that makes the effect to be what it is; actively operative; not inactive, slack, or incapable; characterized by energetic and useful activity; as, an efficient officer, power. source: webster1913
adjective satellite 3. 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...|effective personnel|an efficient secretary|the efficient cause of the revolution source: wordnet30
noun 4. An efficient cause; a prime mover. source: webster1913
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