IPA: /ˌmɛtəˈɛθɪkəl/
KK: /ˈmɛtəˌɛθɪkəl/
Relating to the branch of philosophy that examines the nature, foundations, and meaning of ethical concepts and theories.
The philosopher wrote a paper on metaethical theories to explore the meaning of moral language.
Metaethical → It is formed from "meta-" (from Greek "μετά", meaning beyond or after) and "ethos" (from Greek "ἦθος", meaning character or moral nature). The word "metaethical" refers to concepts that go beyond the basic principles of ethics, exploring the nature and meaning of ethical statements and judgments.
Think of 'beyond' ('meta-') the basic ideas of 'character' ('ethos') to remember that 'metaethical' deals with the deeper questions of ethics.