On Sundays.
To spend Sunday (at a certain place, with a certain person or people, etc.).
A comic strip published in a Sunday newspaper.
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 newspaper published on Sunday.
An event with a formal dress code.
Formalin.
A formal parameter.
An evening gown.
An acetal formed from formaldehyde.
Official.
Relating to mere manipulation and construction of strings of symbols, without regard to their meaning.
Relating to formation.
Organized; well-structured and planned.
Being in accord with established forms.
Relating to the form or structure of something.
Ceremonial or traditional.
Proper, according to strict etiquette; not casual.