Serious; staid; businesslike.
Of a collar, able to be buttoned down to the shirt, as over a necktie.
Conservative; conventional; unimaginative.
A shirt with a button-down collar
Being in accord with established forms.
Official.
Relating to mere manipulation and construction of strings of symbols, without regard to their meaning.
Relating to formation.
Organized; well-structured and planned.
Relating to the form or structure of something.
Ceremonial or traditional.
Proper, according to strict etiquette; not casual.
An event with a formal dress code.
Formalin.
A formal parameter.
An evening gown.
An acetal formed from formaldehyde.