What is the meaning of Moral?

Relating to duty or obligation; pertaining to those intentions and actions of which right and wrong, virtue and vice, are predicated, or to the rules by which such intentions and actions ought to be directed; relating to the practice, manners, or conduct of men as social beings in relation to each other, as respects right and wrong, so far as they are properly subject to rules.

Source: Webster’s Revised Unabridged Dictionary (1913), via OPTED