<p><strong>Noun</strong></p><ul><li>the customs and regulations dealing with diplomatic formality, precedence, and etiquette.</li><li>an original draft, minute, or record from which a document, especially a treaty, is prepared.</li><li>a supplementary international agreement.</li><li>an agreement between states.</li><li>an annex to a treaty giving data relating to it.</li><li>Medicine/Medical: the plan for carrying out a scientific study or a patient's treatment regimen.</li><li>Computers: a set of rules governing the format of messages that are exchanged between computers.</li><li>Also called protocol statement, Philosophy: a statement reporting an observation or experience in the most fundamental terms without interpretation; sometimes taken as the basis of empirical verification, as of scientific laws.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to draft or issue a protocol.</li></ul>