Englishfor English speakers
motivation
Noun
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Someone's motivation is their feeling that they want to do something.
Students' motivation is falling because the lessons are not interesting.
There isn't a simple link between pay and employee motivation.
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Your motivation is the reason you do something.
The main motivation behind the deal was money.
What was your motivation for leaving home?
theory
Noun
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A theory is an idea that tries to explain an observation.
The new information showed that his theory about growth was incorrect.
Nobody has disproved Einstein's theory of general relativity.