night
noun
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darkness“it vanished into the night”
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the dark part of the diurnal cycle considered a time unit“Three nights later, I took my first flying lessons.”
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the time after sunset and before sunrise while it is dark outsidedark
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the time between sunset and midnight“They watched television every night.”
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the period spent sleeping“I had a restless night”
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a period of ignorance or backwardness or gloom
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a shortening of nightfall“they worked from morning to night”