night

1 night /ˈnaɪt/ noun
plural nights
1 night
/ˈnaɪt/
noun
plural nights
Britannica Dictionary definition of NIGHT
1 
: the time of darkness between one day and the next : the part of the day when no light from the sun can be seen and most people and animals sleep
[noncount]
[count]
2 
[noncount] : the darkness that occurs during the nighttime
3 
[count] : the final part of the day that is usually after work, school, etc., and before you go to bed : the early part of the night : evening
4 
[count]
a  : an evening or night that has a special event
b  : the part of a special day that occurs during the nighttime
— compare eve 2

day and night

or night and day
— see day

night night

or nighty night
— used by a child or when speaking to a child as a way of saying “good night”

the still of the night

— see 4still
2 night /ˈnaɪt/ adjective
2 night
/ˈnaɪt/
adjective
Britannica Dictionary definition of NIGHT
always used before a noun
1 
: of or relating to the night
2 
: for use at night
3 
a  : happening at night
b  : active, working, or operating at night