Efficient
/ɪˈfɪʃənt/
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Definition
(adj) Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
Sentence Examples
Can you guess which cooler is the most efficient?
This computer is powerful, efficient, and easy to use.
CEFR Practice Quiz
Can you guess which cooler is the most ____?