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English definition of “formal”

formal

adjective    /ˈfɔr·məl/
using an agreed and often official or traditional way of doing things: There are formal procedures for applying to become a US citizen. If a social occasion is formal, you wear traditional or very good clothes: It was a formal affair, and men were supposed to wear dark suits or tuxedos. Formal language is the language used esp. in writing in situations that are official and which is often more difficult than the language used in ordinary conversation. Formal education/training is the learning of a subject or skill from courses in a school: His formal education ended at the sixth grade, but he became a millionaire at the age of thirty.
(Definition of formal adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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