Doctrine, from Latin doctrina, (compare doctor), means "a body of teachings" or "instructions", taught principles or positions, as the body of teachings in a branch of knowledge or belief system. The Greek analogy is the etymology of catechism.
Often doctrine specifically connotes a corpus of religiousdogma as it is promulgated by a church, but not necessarily: doctrine is also used to refer to a principle of law, in the common law traditions, established through a history of past decisions (such as the doctrine of self-defense, or the principle of Fair use, or the more narrowly applicable First Sale Doctrine.
Sometimes 'doctrine' is an ambitious word for a mere slogan: the slogan 'Peace_through_strength' is termed a 'doctrine' at Wikipedia.
The term also applies to the concept of an established procedure to a complex operation in warfare. The typical example is tactical doctrine in which a standard set of maneuvers, kinds of troops and weapons are employed as a default approach to a kind of attack.
Many more examples can be found at Wikipedia by searching doctrine * (doctrine and an asterisk).
The term indoctrination came to have awkward connotations during the 20th century, but it is necessary to retain it, in order to distinguish it from education. In education one is asked to stand as much as possible outside the body of accumulated knowledge and analyse it. In indoctrination on the other hand, one stands within the body of knowledge and absorbs its teachings. Compare theology and comparative religion for examples, of which many could be drawn.
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