formal

being in accord with established forms and conventions and requirements (as e.g. of formal dress)

• “pay one”
• “;”
• “;”
• “;”
• “;”

characteristic of or befitting a person in authority

• “formal duties”
• “an official banquet”

(of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms

• “the paper was written in formal English”

represented in simplified or symbolic form

logically deductive

• “formal proof”

refined or imposing in manner or appearance; befitting a royal court

• “a courtly gentleman”