The seventh day of the week in many religious traditions, and the sixth day of the week in systems using the ISO 8601 norm; observed as the Sabbath/Shabbat in Judaism (Friday sunset to Saturday sunset); it follows Friday and precedes Sunday.
On Saturday.
The first day of the week in many religious traditions, and the seventh day of the week in systems using the ISO 8601 standard; the Christian Sabbath; the Lord's Day; it follows Saturday and precedes Monday.
A comic strip published in a Sunday newspaper.
A newspaper published on Sunday.
On Sundays.
To spend Sunday (at a certain place, with a certain person or people, etc.).