1. Of or relating to ethics
2. Involving or expressing moral approval or disapproval
3. Conforming to accepted standards of conduct
4 of a drug; restricted to sale only on a doctor's prescription

1. A system of principles governing morality and acceptable conduct; SYN. ethical code.
2. The principles of right and wrong that are accepted by an individual or a social group; SYN. moral principle, value-system, value orientation.