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Protocol

PROH-tuh-kol /ˈprəʊ.tə.kɒl/

nounB2TOEFLIELTSGRE

formaltechnicalbusiness

The official system of rules, correct behavior, or established procedures governing an organization or system.

In digital communication, protocol refers both to human etiquette (e.g., CC rules) and technical networking rules (e.g., SMTP, IMAP).

The story behind the word. In ancient Greece, a prōtokollon was the very first sheet glued (kolla) onto a papyrus scroll. It contained the date, owner, and official summary. That cover note evolved into official legal documentation rules, and eventually digital protocol.

Word relationships

procedure: 'Procedure' is a step-by-step set of actions, while 'protocol' carries an authority of formal etiquette or code.
etiquette: 'Etiquette' focuses specifically on social manners, whereas 'protocol' includes official regulations and technical systems.

improvisation: 'Improvisation' is acting without set rules or established procedures.
breach: A violation or disregard of established rules.

Commonly confused with

prototype: A 'prototype' is an early sample or model, while a 'protocol' is a formal rule or procedure.

Word family

protocolize (verb): To register or formulate in official protocol.
protocolary (adjective): Pertaining to official diplomatic etiquette.

Collocations

email protocol
standard protocol
follow protocol
security protocol

Example sentences

"Following corporate email protocol requires marking confidential messages with clear headers." Corporate email guidelines
"Standard internet communication protocols ensure that messages route correctly across different servers." Network engineering

Memory hook

PROTOcol = FIRST (proto) GLUE (kol) holding the rules together. The glued-on rules of order.

When not to use

Do not use for casual, informal personal habits like how you make coffee in the morning.

Fun facts

Because the first page glued to papyrus proved authenticity, 'protocol' meant legal record keeping for over 1,500 years before applying to internet networks like HTTP.