Protocol is a system of rules about the correct way to act in formal situations.
例句
He has become something of a stickler for the finer observances of royal protocol.他已經變得非常刻板，哪怕是最細微的皇室禮儀也會遵循。...minor breaches of protocol.小小的失禮
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（信息交換）協議
A protocol is a set of rules for exchanging information between computers.
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議定書；協議
A protocol is a written record of a treaty or agreement that has been made by two or more countries.
例句
...the Montreal Protocol to phase out use and production of CFCs...逐步停止使用及生產含氯氟烴的《蒙特利爾議定書》There are also protocols on the testing of nuclear weapons.也有關于核武器試驗的協議。
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治療方案；科學實驗計劃
A protocol is a plan for a course of medical treatment, or a plan for a scientific experiment.
例句
...the detoxification protocol.戒毒方案
英漢詞典釋義
n.
禮儀;外交禮儀
We must observe the correct protocol.我們必須遵守應有的禮儀。
(外交條約的)草案,草約;(尤指)議定的條款,議定書
The statesmen signed a protocol.那些政治家簽了議定書。
英英詞典釋義
Noun
1. (computer science) rules determining the format and transmission of data
2. forms of ceremony and etiquette observed by diplomats and heads of state