night

1. (countable) The time when the Sun is below the horizon when the sky is dark.Examples: "Most animals are awake at day and sleep at night."; "The Bat—they called him the Bat. Like a bat he chose the night hours for his work of rapine; like a bat he struck and vanished, pouncingly, noiselessly; like a bat he never showed himself to the face of the day."; "Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits. ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found."countable

2. (astronomy, countable) 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.countable

3. (law, countable) A period of time often defined in the legal system as beginning 30 minutes after sunset, and ending 30 minutes before sunrise.countable

4. (countable) An evening or night spent at a particular activity.Examples: "a night on the town"; "From the ground, Colombo’s port does not look like much. Those entering it are greeted by wire fences, walls dating back to colonial times and security posts. For mariners leaving the port after lonely nights on the high seas, the delights of the B52 Night Club and Stallion Pub lie a stumble away."Synonyms: eveningcountable

5. (countable) A day, or at least a night.Examples: "I stayed my friend's house for three nights."countable

6. (uncountable) Nightfall.Examples: "from noon till night"Synonyms: darkuncountable