Englishfor English speakers
demonstration
Noun
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A demonstration of something is the act of showing that it is true or that it exists.
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A demonstration of something is the act of showing how to do it or use it.
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A demonstration is a gathering of people to protest something publicly.
testing
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noun
the act of subjecting to experimental test in order to determine how well something works
they agreed to end the testing of atomic weapons
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noun
an examination of the characteristics of something
there are laboratories for commercial testing
it involved testing thousands of children for smallpox
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noun
the act of giving students or candidates a test (as by questions) to determine what they know or have learned