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.
A dress code specifying white tie for men and ball gown or evening dress for women, or, alternatively, full military dress or national costume.
The most formal kind of eveningwear for men, consisting of an evening tailcoat, trousers with strips of braid down the side seams, white stiff-fronted shirt, white bow tie and waistcoat with or without sash.