philosophy dealing with the principles of morality; ethics.
Origin of moral philosophy
First recorded in 1600–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for moral philosophy
the branch of philosophy dealing with both argument about the content of morality and meta-ethical discussion of the nature of moral judgment, language, argument, and value
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012