Englishfor English speakers
solution
Noun
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A solution is an answer to a problem.
The solution to the math problem 4+3 is 7.
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A solution is a liquid that has something dissolved in it.
The student made a solution by mixing salt and water.
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.