Doctrine (noun)

1. A principle or set of principles presented for acceptance or belief, especially as being authoritative.
2. A principle of law established through past decisions.
3. A particular principle, belief, or policy taught or advocated, especially by a religious, political, or other group.

Origin:

Late middle english: from latin doctrina 'teaching, learning, knowledge', from doctus 'taught', past participle of docere 'teach'. the current sense dates from the early 17th century.

Examples:

1. The company's doctrine is to provide the highest quality products and customer service.
2. The court ruled that the doctrine of sovereign immunity protected the government from being sued.
3. The religious doctrine of forgiveness is a central tenet of the faith.
4. The doctrine of the political party emphasized individual freedom and limited government.
5. The military academy taught the doctrine of loyalty, duty, respect, and selfless service.