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The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark.
example
How do you sleep at night when you attack your kids like that!?
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(Astronomy) The period of darkness beginning at the end of evening astronomical twilight when the sun is 18 degrees below the horizon, and ending at the beginning of morning astronomical twilight.
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(Legal) Often defined in the legal system as beginning 30 minutes after sunset, and ending 30 minutes before sunrise.
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An evening or night spent at a particular activity.
example
a night on the town
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A night (and part of the days before and after it) spent in a place away from home, e.g. a hotel.
example
I stayed my friend's house for three nights.
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Nightfall.
example
from noon till night
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Darkness (due to it being nighttime).
example
The cat disappeared into the night.
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A dark blue colour, midnight blue.
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A night's worth of competitions, generally one game.