efficiency efficience • efficient · · · Info · Definitions · Antonyms · Characters · · efficiency · · Text Latin · · Script 10 · · Length Definitions · · · (noun) the ratio of the output to the input of any system. · · Noun Definition 1 (noun) skillfulness in avoiding wasted time and effort. Example: "She did the work with great efficiency." · · Noun Definition 2 Antonyms · · · inefficiency · · Antonym 0 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E y latin small letter y U+0079