Refers to the time around 12 PM. Often used in compounds like 昼休み (lunch break) or 昼食 (lunch).
See also: お昼
Let's meet at noon.
I always spend my lunch break in the park.
Only when written 昼 / 晝
Used for the period of daylight, as opposed to night. Can function as a noun or adverbially.
See also: お昼
Let's finish the shopping during the daytime.
He works day and night.
Only when written 昼 / 晝
Short for 昼食 or 昼ご飯. Common in casual conversation.
See also: お昼
What did you have for lunch?
Want to go get ramen for lunch?
While we were talking, it became noon already.
It started raining from noon onward.
Let's go get lunch soon.
lunch; midday meal
lunch break; noon recess
just past noon; afternoon
morning; forenoon · just before noon
early afternoon
midday; broad daylight
Japanese bindweed; Calystegia japonica
lunch; midday meal
day and night; around the clock
just before noon; late morning · late-morning snack; elevenses
daytime; during the day
afternoon meeting; afternoon gathering
matinee; daytime performance
daytime soap opera; daytime drama series
noon; lunchtime
daytime job; day job
around noon; about midday