What is the meaning of formal?

noun

• A lavish dance requiring formal attire.
  • synonyms: ball
• A gown for evening wear.
  • synonyms: dinner dress, dinner gown, evening gown

adjective

• Being in accord with established forms and conventions and requirements (as e. G. Of formal dress. )
  • usage: "pay one's formal respects"; "formal dress"; "a formal ball"; "the requirement was only formal and often ignored"; "a formal education"
• Characteristic of or befitting a person in authority.
  • usage: "formal duties"; "an official banquet"
• Of spoken and written language. ( adhering to traditional standards of correctness and without casual, contracted, and colloquial forms)
  • usage: "the paper was written in formal English"
• Represented in simplified or symbolic form.
  • synonyms: conventional, schematic
• Logically deductive.
  • usage: "formal proof"
• Refined or imposing in manner or appearance; befitting a royal court.
  • usage: "a courtly gentleman"
  • synonyms: courtly, stately