# protocol

/ˈpɹoʊtəˌkɑɫ/ (US) · /pɹˈəʊtəkˌɒl/ (UK)

Source: https://englishreference.com/word/protocol
Updated: 2026-07-22

## Senses

### 1. code of conduct

noun · CEFR B2 · Formal

the official rules for how people should behave at formal events or in government.

For teachers: the system of rules and conventions governing correct etiquette and precedence between diplomatic representatives and heads of state.

- According to royal protocol, you must wait for the Queen to speak first.
- The visiting dignitaries were careful to observe every nuance of diplomatic protocol to avoid any perceived slight during the summit.

### 2. scientific/medical procedure

noun · CEFR C1 · Technical · Academic

a detailed plan or set of steps for a scientific experiment or medical treatment.

For teachers: a formalised set of procedures to be followed in a clinical trial, medical treatment, or scientific experiment.

- The hospital has a strict protocol for cleaning surgical tools.
- The research team strictly adhered to the experimental protocol to ensure that the results could be accurately replicated by other laboratories.

### 3. computing rules

noun · CEFR C1 · Technical

a set of rules that computers use to talk to each other and send information.

For teachers: a standardised set of rules governing the format and transmission of data between devices in a network.

- HTTP is the protocol used for transferring data on the web.
- The software update failed because the legacy hardware was incompatible with the new security protocol implemented by the server.

### 4. official agreement

noun · CEFR C1 · Formal

a formal document that records an agreement between countries.

For teachers: an official record of a diplomatic negotiation or an amendment to an international treaty.

- The two nations signed a new protocol to protect the environment.
- The Kyoto Protocol established legally binding obligations for developed countries to reduce their greenhouse gas emissions.

## Examples

- The hospital has a strict protocol for cleaning the rooms.
- The research team followed the established protocol to ensure the results of the drug trial were accurate and repeatable.
- In international diplomacy, even a minor breach of protocol regarding seating arrangements can be interpreted as a significant political slight, potentially derailing sensitive negotiations before they have even begun.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.