the.com/doctrine

means A set of principles or teachings put forward by an authority—religious, political, or military—for people to accept and follow.

from From Latin doctrina, 'teaching, body of instruction,' rooted in docere, 'to teach' (the same root that gives us 'doctor,' originally just a 'teacher,' and 'document,' originally something that instructs). It passed through Old French doctrine into English, carrying the sense of formalized, authoritative teaching from the start — the word has always had a whiff of the classroom about it, even when it's being used for foreign policy or church dogma.