Dictionary.com
definitions

metaethics

or met·a-eth·ics

[met-uh-eth-iks, met-uh-eth-]
noun (usually used with a singular verb)
  1. the philosophy of ethics dealing with the meaning of ethical terms, the nature of moral discourse, and the foundations of moral principles.

Origin of metaethics

First recorded in 1945–50; meta- + ethics
Related formsmet·a·eth·i·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018