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. [1913 Webster]
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?
, n.
the principles of right and wrong that are accepted by an individual or a social group; as, the Puritan ethic. [WordNet 1.5]
a system of principles governing morality and acceptable conduct. [WordNet 1.5]