- [uncountable]
a system of fixed rules and formal behaviour used at official meetings, usually between governments 礼仪；外交礼节 a breach of protocol 违反外交礼节 the protocol of diplomatic visits 外交访问的礼仪
- [countable] (specialist)
the first or original version of an agreement, especially a treaty between countries, etc.; an extra part added to an agreement or treaty 条约草案；议定书；（协议或条约的）附件 the first Geneva Protocol 《日内瓦四公约》第一议定书 It is set out in a legally binding protocol which forms part of the treaty. 这在有法律约束力的、构成条约一部分的附件中有说明。 The dates were agreed under a protocol to the climate convention. 这些日期是根据气候公约的一项议定书商定的。
- [countable] (
computing 计算机 a set of rules that control the way data is sent between computers （数据传输的）协议 - [countable] (specialist)
a plan for performing a scientific experiment or medical treatment 科学实验计划；医疗方案
Word Originlate Middle English (denoting the original minute of an agreement, forming the legal authority for future dealings relating to it): from Old French prothocole, via medieval Latin from Greek prōtokollon ‘first page, flyleaf’, from prōtos ‘first’ + kolla ‘glue’. Sense 1 derives from French protocole, the collection of set forms of etiquette to be observed by the French head of state, and the name of the government department responsible for this (in the 19th cent.).