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The definition of formal

11 Definitions of: formal

    1. adjective, of, according to, or following established or prescribed forms, conventions, etc
    2. adjective, characterized by observation of conventional forms of ceremony, behaviour, dress, etc
    3. adjective, methodical, precise, or stiff
    4. adjective, suitable for occasions organized according to conventional ceremony
    5. adjective, denoting or characterized by idiom, vocabulary, etc, used by educated speakers and writers of a language
    6. adjective, acquired by study in academic institutions
    7. adjective, regular or symmetrical in form
    8. adjective, of or relating to the appearance, form, etc, of something as distinguished from its substance
    9. adjective, logically deductive
    10. adjective, philosophy a) of or relating to form as opposed to matter or content b) pertaining to the essence or nature of something c) (in the writings of Descartes) pertaining to the correspondence between an image or idea and its object d) being in the formal mode
    11. adjective, denoting a second-person pronoun in some languages used when the addressee is a stranger, social superior, etc
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From Collins