protocol
• noun 1 the official procedure or system of rules governing affairs of state or diplomatic occasions. 2 the accepted code of behaviour in a particular situation. 3 the original draft of a diplomatic document, especially of the terms of a treaty. 4 a formal record of scientific experimental observations. 5 Computing a set of rules governing the exchange or transmission of data between devices. — ORIGIN originally in the sense original note of an agreement : from Greek protokollon ‘first page, flyleaf’.
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