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Formal and Informal, and Formality and Informality, may refer to

Dress code and events[edit]

Logic and mathematics[edit]

Computer science[edit]

  • Formal methods, mathematically based techniques for the specification, development and verification of software and hardware systems
  • Formal specification, describes what a system should do, not how it should do it
  • Formal verification, proves correctness of a system



Social regulation[edit]


  • Informal vote, a spoiled, void, null vote cast in an election
  • MV Formality, coaster (formerly Empire Favourite) owned by F T Everard & Sons, scrapped in 1962