Sun‧day [uncountable and countable]
1TMC written abbreviation Sun.
the day between Saturday and Monday
We're going to a match on Sunday.
What are you doing Sunday? American English
Sunday morning/afternoon etc
Sunday nights are usually pretty quiet.
It was our wedding anniversary last Sunday.
There's another antiques market this Sunday.
next Sunday (=Sunday of next week)
We'll announce the winners next Sunday.
a Sunday (=one of the Sundays in the year)
Finding a dentist on a Sunday can be very difficult.
your best clothes, worn only for special occasions or for church
an insulting word meaning someone who annoys other people by driving too slowly