Ethic

a.	1.	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?
n.	1.	the principles of right and wrong that are accepted by an individual or a social group; as, the Puritan ethic.
	2.	a system of principles governing morality and acceptable conduct.

Noun	1.	ethic - the principles of right and wrong that are accepted by an individual or a social group; "the Puritan ethic"; "a person with old-fashioned values" Synonyms: moral principle, value orientation, value-system
	2.	ethic - a system of principles governing morality and acceptable conduct Synonyms: ethical code

double standard, ethical code, precept, principle, system, system of rules