A belief or set of beliefs held and taught by a church, political party, or other group. The doctrine of the Trinity is central to most Christian faiths.
A stated principle of government policy, mainly in foreign or military affairs. The Monroe Doctrine was a significant policy in American history.
In law, a rule or principle established by judicial decisions or precedent. Under the doctrine of res judicata, the case could not be tried a second time.
The act or practice of teaching or imparting knowledge; instruction. The doctrine of physics was rigorously taught to every cadet.