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.
period
Noun
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A period is a length of time.
There was a short period when my computer stopped working.
During the first period, Germany scored two goals.
The dinosaurs lived from late in the Triassic period (about 225 million years ago) until the end of the Cretaceous (about 65 million years ago).
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A period is the dot that marks the end of most sentences in English. This -> . is a period.
Should I use an exclamation mark or a period at the end of this sentence?
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A woman's period is the time each month when she passes blood.
I have missed two periods now. I think I must be pregnant.
period
Interjection
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And nothing else; and nothing less; used for emphasis.
When I say "eat your dinner," it means "eat your dinner", period!