PRINCIPLE

(MORAL RULE) [noun] approving - a moral rule or standard of good behaviourJack doesn't have many principles or scruples. [C]She's a woman of principle (= a good honest woman). [U]If you do something as a matter of principle or on principle, you do it because you believe it is right or the right to do.I never gamble, as a matter of principle (= because I believe it is wrong).She would never ask to borrow money, on principle.