the day of the week that comes after Saturday and before Monday
We went hiking last Sunday because the weather was perfect.
On Sunday, many families eat breakfast together.
✦ Old English “Sunnandæg,” literally “day of the sun,” translating Latin “dies Solis.”
on Sunday; used without the preposition “on” to say when something happens
Let's meet Sunday at the coffee shop around noon.
The museum opens Sunday at ten o'clock.
✦ Adverbial use developed from the noun by omitting the preposition “on.”
