Englishfor English speakers
efficient
Adjective
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If something is efficient, it can do a lot but uses very little time, energy, money, etc.
He wastes a lot of time talking, and isn't very efficient at work.
Smaller cars are generally more fuel-efficient than big cars.
consumer
Noun
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A consumer is someone who buys or uses goods or services.
Consumer demand for large cars has dropped with the increase in gasoline prices.
Selling goods to consumers is known as retail.
response
Noun
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A response is some words or actions that happen as a reaction to something else.
We sent a message to them two weeks ago, but there has been no response so far.
The police response to these problems has been slow and weak.
In psychology, a response is a behavior which occurs after a stimulus.