1. (noun) ball, formal
a lavish dance requiring formal attire
2. (adj) dinner dress, dinner gown, formal, evening gown
a gown for evening wear
3. (adj) formal
being in accord with established forms and conventions and requirements (as e.g. of formal dress)
"pay one's formal respects"; "formal dress"; "a formal ball"; "the requirement was only formal and often ignored"; "a formal education"
4. (adj) formal
characteristic of or befitting a person in authority
"formal duties"; "an official banquet"
5. (adj) formal
(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"
6. (adj) conventional, formal, schematic
represented in simplified or symbolic form
7. (adj) formal
logically deductive
"formal proof"
8. (adj) courtly, formal, stately
refined or imposing in manner or appearance; befitting a royal court
"a courtly gentleman"
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Definition of 'formal' 
