- 1[uncountable] a system of fixed rules and formal behavior used at official meetings, usually between governments a breach of protocol the protocol of diplomatic visits
- 2[countable] (technology) the first or original version of an agreement, especially a treaty between countries, etc.; an extra part added to an agreement or treaty the first Geneva Protocol It is set out in a legally binding protocol which forms part of the treaty.
- 3[countable] (computing) a set of rules that control the way data is sent between computers
- 4[countable] (technology) a plan for performing a scientific experiment or medical treatment
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