pertaining to or dealing with morals or the principles of morality; pertaining to right and wrong in conduct.
being in accordance with the rules or standards for right conduct or practice, especially the standards of a profession: It was not considered ethical for physicians to advertise.
(of drugs) sold only upon medical prescription.

1600–10; ethic + -al1

ethically, adverb
ethicality, ethicalness, noun
hyperethical, adjective
hyperethically, adverb
nonethical, adjective
nonethically, adverb
nonethicalness, noun
pseudoethical, adjective
pseudoethically, adverb
superethical, adjective
superethically, adverb
unethical, adjective

2. moral, upright, honest, righteous, virtuous, honorable.

2. immoral. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ethical (ˈɛθɪkəl)
1.  in accordance with principles of conduct that are considered correct, esp those of a given profession or group
2.  of or relating to ethics
3.  (of a medicinal agent) available legally only with a doctor's prescription or consent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from ethic + -al. Related: Ethicality; ethically.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ethical eth·i·cal (ěth'ĭ-kəl)

  1. Of, relating to, or dealing with ethics.

  2. Being in accordance with the accepted principles of right and wrong that govern the conduct of a profession.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He seems to mean that he is in favour of ignoring general moral and ethical
  principles because they are meaningless.
It is also a milestone in bioethics, touching as it does on a number of moral
  and ethical issues surrounding the end of life.
Robinson traces the evolution of the concept of "natural life" as an
  ethical standard.
And recently Senate hearings were held to examine the ethical issues.
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