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protocol

noun [U] (RULES)
 
 
/ˈprəʊ.tə.kɒl/ US  /ˈproʊ.t̬ə.kɑːl/

Definition

the system of rules and acceptable behaviour used at official ceremonies and occasions: a breach of Royal protocol diplomatic protocolCeremoniesRules and laws
(Definition of protocol noun (RULES) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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