In modern usage, junta typically refers to a collective military dictatorship, which comprises a committee of high-ranking military officers (itself called a junta). Juntas are often not collegial in practice, as one officer often holds most power.
In Spanish, junta, literally "joint (meeting)", is used for various collegial bodies.
During the Habsburg rule, junta was used for various regular administrative bodies in Iberia and other European countries (including the Low countries, where the French version jointe was also in official use) ruled in personal union by the Spanish crown, and even was maintained in some cases after those were divided in territories brought under the imperial Austrian branch of the dynasty.
In the Napoleonic Era, junta was also the name chosen by several local administrations forming in Spain during the Peninsula War as a patriotic alternative to the official administration topped by the French invaders.
"Jet Set Junta", a song by the influential, though little known, UK band The Monochrome Set (as in the Phish album, the word is pronounced phonetically).