What does "ethic" mean?

Ethic: Of, or belonging to, morals; treating of the moral feelings or duties; containing percepts of morality; moral; as, ethic discourses or epistles; an ethical system; ethical philosophy. The ethical meaning of the miracles. Trench. Ethical dative (Gram.), a use of the dative of a pronoun to signify that the person or thing spoken of is regarded with interest by some one; as, Quid mihi Celsus agit How does my friend Celsus do