Etymology
Derived literally from "Sun's Day".
Noun
- The first day of the week in the USA.
- The seventh day of the week in Europe and in systems using the ISO 8601 norm.
- The "venerable day of the sun", as declared by Roman Emperor Constantine on March 7, AD 321.
Put simply, it follows Saturday and precedes Monday and is the sabbath for most Christians.
- An appointment, person, or feeling associated with this day of the week.