Captain is a title, an appellative for the commanding officer of a military unit; the commander or highest rank officer of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police department, election precinct, etc. In militaries, the captain is typically at the level of an officer commanding a company or battalion of infantry, a ship, or a battery of artillery, or another distinct unit. It can also be a rank of command in an air force. The term also may be used as an informal or honorary title for persons in similar commanding roles.
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Etymology
The word "captain" derives from the Middle English "capitane", from Anglo-French "capitain", itself coming from the Latin "caput", meaning "head". It is considered cognate with the Greek word katepánō (Ancient Greek: κατεπάνω, lit. '[the one placed] at the top', or "the topmost"), which was used as title for a senior Byzantine military rank and office. The word was Latinized as Ancient Greek: capetanus or catepan. Both ultimately derive from the Proto-Indo-European "*káput", also meaning head.
Occupations or roles
Captain (armed forces), a commissioned officer rank corresponding to NATO OF-2 level. Typically commander of a company size unit, or equivalent. It is also a rank of command in the air force.
Captain (naval), a commissioned officer rank in the navy, corresponding to the rank of Army colonel, Air force colonel.
Captain (nautical), a licensed person or civilian marine officer who is legally in command of a merchant ship, a yacht or another type of vessel that may or may not be carrying passengers for hire; corresponds to the work condition of shipmaster or, as usually said, master.
Captain (airlines), a licensed professional pilot who is legally in command of a civil aircraft; corresponding to the position of pilot in command (PIC).
Fire captain, officer in a fire department.
Police captain, officer in a police organization.
Group captain, a senior commissioned rank in many air forces.
Captain of industry, business leader.
Captain of the port, harbour (UK) or Coast Guard (USA) post.
Precinct captain, political party's representative at an election precinct in the United States.
Barangay captain, Head of Barangay (Village) in the Philippines
School captain, student elected or appointed to represent the school.
Captain Regent, head of state of San Marino.
Military ranks
Canada
Captain (Canadian naval rank)
Captain (Canadian army and air force)
Germany
Kapitän bzw. "Kapitän zur See" (Deutsche Marine), Nato OF-5 grade
Hauptmann, the german equivalent of Captain in Army (Armee/Heer) and Air Force (Luftwaffe)
India
Captain (Indian Navy)
Group captain (India)
Israel
Seren, an Israel Defense Forces officer rank whether Army, Air Force, or Navy
South Africa
Captain is a South African National Defence Force officer rank of the South African Army, South African Air Force, South African Navy, South African Military Health Service
United Kingdom
Captain (Royal Navy), NATO OF-5 grade
Captain (British Army and Royal Marines), NATO OF-2 grade
Group Captain (Royal Air Force), NATO OF-5 grade
United States
Captain (United States)
Captain (United States O-3) (US Air Force, Army, Marine Corps, or Space Force)
Captain (United States O-6) (US Navy, US Public Health Service, or Coast Guard)
Generic
Captain (naval)
Captain at sea
Captain of sea and war
Other captain grades
Ship-of-the-line captain
Senior Captain
Staff captain