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.
source: Webster 1913
noun
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.
source: WordNet 3.0
a system of principles governing morality and acceptable conduct