Etymology
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ethic (n.)

late 14c., ethik "study of morals," from Old French etique "ethics, moral philosophy" (13c.), from Late Latin ethica, from Greek ēthike philosophia "moral philosophy," fem. of ēthikos "ethical, pertaining to character," from ēthos "moral character," related to ēthos "custom" (see ethos). Meaning "moral principles of a person or group" is attested from 1650s.

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Definitions of ethic

ethic (n.)
the principles of right and wrong that are accepted by an individual or a social group;
the Puritan ethic
Synonyms: moral principle / value-system / value orientation
ethic (n.)
a system of principles governing morality and acceptable conduct;
Synonyms: ethical code
From wordnet.princeton.edu