Definition from Wiktionary, the free dictionary
From Old French ethique, from Late Latin ethica, from Ancient Greek ἠθική (ēthikḗ), from ἠθικός (ēthikós, “of or for morals, moral, expressing character”), from ἦθος (êthos, “character, moral nature”).
ethics (plural ethics)
- (philosophy) The study of principles relating to right and wrong conduct.
- The standards that govern the conduct of a person, especially a member of a profession.
- Although the terms ethics and morality are often used interchangeably, philosophical ethicists sometimes distinguish them, using ethics to refer to theories and conceptual studies relating to good and evil and right and wrong, and using morality and its related terms to refer to actual, real-world beliefs and practices concerning proper conduct. In this vein, the American philosopher Brand Blanshard wrote concerning his friend, the eminent British ethicist G. E. Moore: "We often discussed ethics, but seldom morals. . . . He was a master in ethical theory, but did not conceive himself as specially qualified to pass opinions on politics or social issues." 
Terms derived from ethics
study of principles governing right and wrong conduct
standards of conduct
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