Sentai
Encyclopedia
in Japanese language
Japanese language
is a language spoken by over 130 million people in Japan and in Japanese emigrant communities. It is a member of the Japonic language family, which has a number of proposed relationships with other languages, none of which has gained wide acceptance among historical linguists .Japanese is an...

 is a word for a military unit and may be literally translated as "squadron", "task force", "group
Group (air force unit)
A group is a military aviation unit, a component of military organization and a military formation. Usage of the terms group and wing differ from one country to another, as well as different branches of a defence force, in some cases...

" or "wing
Wing (air force unit)
Wing is a term used by different military aviation forces for a unit of command. The terms wing, group or Staffel are used for different-sized units from one country or service to another....

". The terms "regiment
Regiment
A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

" and "flotilla
Flotilla
A flotilla , or naval flotilla, is a formation of small warships that may be part of a larger fleet. A flotilla is usually composed of a homogeneous group of the same class of warship, such as frigates, destroyers, torpedo boats, submarines, gunboats, or minesweepers...

", while sometimes used as translations of Sentai, are also used to refer to larger formations.

World War II

It is perhaps best known as a term used during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 by the military of the Empire of Japan
Empire of Japan
The Empire of Japan is the name of the state of Japan that existed from the Meiji Restoration on 3 January 1868 to the enactment of the post-World War II Constitution of...

, for Imperial Japanese Army Air Force (IJAAF) and Imperial Japanese Navy Air Service
Imperial Japanese Navy Air Service
The Imperial Japanese Navy Air Service was the air arm of the Imperial Japanese Navy during World War II, the organization was responsible for the operation of naval aircraft and the conduct of aerial warfare in the Pacific War.It was controlled by the Navy Staff of the Imperial Japanese Navy and...

 (IJNAS) military aviation
Military aviation
Military aviation is the use of aircraft and other flying machines for the purposes of conducting or enabling warfare, including national airlift capacity to provide logistical supply to forces stationed in a theater or along a front. Air power includes the national means of conducting such...

 units equivalent to a group or wing in other air forces. However, the term had slightly different meanings in the IJAAF and the IJNAS.

An IJAAF Sentai was made up of two to four squadrons
Squadron (aviation)
A squadron in air force, army aviation or naval aviation is mainly a unit comprising a number of military aircraft, usually of the same type, typically with 12 to 24 aircraft, sometimes divided into three or four flights, depending on aircraft type and air force...

 (chūtai). In the IJAAF, two or more Sentai comprised a hikōdan (air brigade
Brigade
A brigade is a major tactical military formation that is typically composed of two to five battalions, plus supporting elements depending on the era and nationality of a given army and could be perceived as an enlarged/reinforced regiment...

). In the later stages of World War II, the IJAAF abolished chūtai and divided its sentai into hikōtai (flying units) and seibitai (maintenance units). A sentai commander (sentaichō) was generally a Lieutenant Colonel
Lieutenant colonel
Lieutenant colonel is a rank of commissioned officer in the armies and most marine forces and some air forces of the world, typically ranking above a major and below a colonel. The rank of lieutenant colonel is often shortened to simply "colonel" in conversation and in unofficial correspondence...

.

In the IJNAS, a sentai was a larger unit: a kōkūtai was the equivalent of an IJAAF sentai. Several sentai made up a kantai (air fleet). In the IJNAS, a Sentaichō was usually a Naval Captain
Captain (naval)
Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The NATO rank code is OF-5, equivalent to an army full colonel....

.

Super Sentai

The is a franchise of Japanese tokusatsu
Tokusatsu
is a Japanese term that applies to any live-action film or television drama that usually features superheroes and makes considerable use of special effects ....

 television dramas
Japanese television drama
, also called , are a staple of Japanese television and are broadcast daily. All major TV networks in Japan produce a variety of drama series including murder romance, comedy, detective stories, horror, and many others...

 that uses the word sentai to describe a group of three or more costumed superhero
Superhero
A superhero is a type of stock character, possessing "extraordinary or superhuman powers", dedicated to protecting the public. Since the debut of the prototypical superhero Superman in 1938, stories of superheroes — ranging from brief episodic adventures to continuing years-long sagas —...

es (whose core team generally consists of five members) who often pilot mecha
Mecha
A mech , is a science fiction term for a large walking bipedal tank or robot, including ones on treads and animal shapes.-Characteristics:...

.
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