What does "tenet" mean?

Tenet: Any opinion, principle, dogma, belief, or doctrine, which a person holds or maintains as true; as, the tenets of Plato or of Cicero. That al animals of the land are in their kind in the sea, . . . is a tenet very questionable. Sir T. Browne. The religious tenets of his family he had early renounced with contempt. Macaulay. See Dogma.