1 rule(s) or code(s) or standard(s) of behaviour or conduct, convention(s), custom(s), diplomacy, formality, formalities, form, etiquette, politesse, manners, practice, usage, authority:
According to protocol, the lady stands at the right of the gentleman. Which protocol are you following, the British or the French?
2 treaty, pact, compact, covenant, agreement, concordat; memorandum, minute, note, draft, outline:
The original protocol must be checked before the ministers attach their signatures.