efficiency
Pronunciation
Noun
B1 Intermediate
Quick answer
The proportion of energy or effort put into a process that is actually converted into useful output.
Synonyms and antonyms
Antonyms
Usage notes
Efficiency is often expressed as a percentage, calculated as useful energy output divided by total energy input.
Test yourself
Which word fits the gap? "Modern LED bulbs have far greater _____ than old incandescent ones."
Answer: efficiency
In your own words, what does "efficiency" mean?
The proportion of energy or effort put into a process that is actually converted into useful output.
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