the day after Saturday and before Monday, usually considered to be the first day of the week in the U.S. and the last day of the week in the U.K.. In Western countries, most people do not work on SundayAre you doing anything nice on Sunday?
If Christmas Day is on a Sunday, the next day is also a holiday.
We usually stay at home Sundays (=every Sunday).
I love quiet Sunday mornings.
I’m going to visit my parents next Sunday.
on Sundays (=every Sunday): We usually go to church on Sundays.