Etymology and Definition

1.1. Etymology of “ethics”

Historic word meanings:

In early Greek: “Ethos” = Customs

In early Roman Latin: Mores = Customs

In German: Sitten (Gebräuche) = Customs

1.2. Definition of “ethics”

Customs: Webster’s: Common use or practice, established manner.
  Duden (Sitten): ..valid, ...customary ... habits
   
Ethical: Webster’s: relating to morals, containing precepts of morality
   
Moral: Webster’s: relating to right and wrong ... as determined by duty
   
Ethics:

Encyclopedia Britannica: The discipline of philosophy concerned with what is morally good and bad, right and wrong; also system or theory of moral values or principles.

  Duden:Norms that form the base of responsible attitudes
   
Morality: Encyclopedia Britannica:
(no commentary)
  Webster’s: The doctrine of moral duties
The quality of an action as estimated by a standard of right and wrong
  Duden: Ethical norms and values regulating the interhuman behavior

Personal Observations

Large “areas” of custom are, by now, relegated to criminal and civil law, others to more or less liberal habits (new meaning of “customs”) without an ethical connotation.

In today’s word usage, “ethical” and “moral” refer only to a few remaining concerns, defined by a combination of human (humane, humanistic) emotions and culturally recognized values:

Besides the above mentioned ideals of humanistic democracy (“Freedom, Brotherhood, and Equality”, and so forth), there is also an obvious correlation between “humanistic values” and

Through the centuries, ethics has always related to the behavior of individuals. In our time, there is an increasing call for ethical behavior of organizations (as in business) and of nations (as in international aid).

In sum: