Noun

(uncountable) The act of connecting.

The point at which two or more things are connected.

the connection between overeating and obesity

My headache has no connection with me going out last night.

* {{quote-news

, year=2004 , date=April 15 , author= , title=Morning swoop in hunt for Jodi's killer , work=The Scotsman citation , page= , passage=A spokesman for Lothian and Borders Police said: "We can confirm that a 15-year-old boy has been arrested and charged in connection with the murder of Jodi Jones. A 45-year-old has also been arrested in connection with allegations of attempting to pervert the course of justice. A report on this has been sent to the procurator fiscal." }}

A feeling of understanding and ease of communication between two or more people.

As we were the only people in the room to laugh at the joke, I felt a connection between us.

An established communications or transportation link.

computers linked by a network connection

I was talking to him, but there was lightning and we lost the connection .

(transport) A transfer from one transportation vehicle to another in scheduled transportation service

The bus was late so he missed his connection at Penn Station and had to wait six hours for the next train.

A kinship relationship between people.

Noun

(en noun)

* 1842 , Thomas Campbell, Frederick the Great and his Times , vol. II, p. 47:

Another account says that, on the morning of the 31st of May, the king delivered to the prince-royal the crown, the sceptre, and the key of his treasure and gave him his blessing. The privy-counsillor Vockerodt drew up at his desire a protocol of the transaction.

* 1970 , Matthew Smith Anderson, The Great Powers and the Near East, 1774-1923 , p. 32:

The terms of this protocol formed the basis for the Treaty of London signed by the British, French and Russian governments on 6 July 1827.

(international law) An amendment to an official treaty.

* 2002 , Philippe Sands, Principles of International Environmental Law , p. 917 n. 253:

The 1992 Protocol amended the definitions of other terms, including ‘ship’, ‘oil’ and ‘incident’: Art. 2.

The first leaf of a roll of papyrus, or the official mark typically found on such a page.

* 1991 , Leila Avrin, Scribes, Script, and Books , p. 146:

They marked the beginning of each scroll with their protocol''''', a practice that continued in the papyrus trade in the Byzantine Empire [...] into the Islamic period, when there were bilingual ' protocols in Greek and Arabic.

The official formulas which appeared at the beginning or end of certain official documents such as charters, papal bulls etc.

* 1985 , Archivum Historiae Pontificiae , v. 23, p. 14:

The protocol of the bull contains elements that appear to be formulaic by the time of John XVIII 's pontificate.

(sciences) The original notes of observations made during an experiment; also, the precise method for carrying out or reproducing a given experiment.

* 1931 , Gye & Purdy, The Cause of Cancer , p. 194:

The following is an abstract of the protocol of the experiment: Tumour extract. —A measured 16 c.c. of minced Rous Sarcoma tissue was ground with sand and extracted with 400 c.c. of 0.8-per-cent. saline.

The official rules and guidelines for heads of state and other dignitaries, governing accepted behaviour in relations with other diplomatic representatives or over affairs of state.

* 2009 , Laura Johnson, "A mwah too far", The Guardian , 19 Sep 2009:

Even the Queen (for whom the curtsey is a more standard address) was recently treated to an enthusiastic Obama embrace. Her Majesty, who is not normally known for partaking in such public displays of affection, seemed unperturbed by Michelle Obama's disregard for royal protocol .

(by extension) An accepted code of conduct; acceptable behaviour in a given situation or group.

* 2010 , The Guardian , 16 Jul 2010:

For those uncertain in the protocol of handshaking a formula for the perfect handshake has been devised by scientists at the University of Manchester.

(computing) A set of formal rules describing how to transmit or exchange data, especially across a network.

* 2006 , Zheng & Ni, Smart Phone and Next-Generation Mobile Computing , p. 444:

An exception is Jabber, which is designed based on an open protocol called the extensible messaging and presence protocol (XMPP).

(medicine) The set of instructions allowing a licensed medical professional to start, modify, or stop a medical or patient care order.