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1. Of, relating to, or dealing with ethics: an ethical treatise.
2. Being in accordance with the accepted principles of right and wrong that govern the conduct of a profession: an ethical act. See Synonyms at moral.
3. Relating to or being a drug dispensed solely on the prescription of a physician.
eth′i·cal·ness, eth′i·cal′i·ty (-kăl′ĭ-tē) n.