noun
military order
Refers to a medieval Christian military order, such as the Knights Templar or the Teutonic Order.
テンプル騎士団は有名な騎士修道会の一つです。
The Knights Templar is one of the famous military orders.
騎士団 is a broader term for any order of knights, while 騎士修道会 specifically refers to a military order with a religious monastic character.
Compound of 騎士 (knight) + 修道会 (religious order). The term is a modern Japanese coinage for Western medieval military orders.