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English definition of “protocol”

protocol

noun uk   /ˈprəʊ.tə.kɒl/ us    /ˈproʊ.t̬ə.kɑːl/

protocol noun (RULES)

[U] the system of rules and acceptable behaviour used at official ceremonies and occasions: a breach of Royal protocol diplomatic protocolCeremoniesRules and laws

protocol noun (AGREEMENT)

[C] a formal international agreement: The Geneva Protocol of 1925 prohibits the use of poisonous gases in war.Official documentsInternational politics and government

protocol noun (IN COMPUTING)

[C] specialized computing a computer language allowing computers that are connected to each other to communicateComputer concepts
(Definition of protocol from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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