The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun (used with a sing. verb)
The study of the meaning and nature of ethical terms, judgments, and arguments.
- metˌa·ethˈi·cal adjective