Meaning

noun a person who is a member of an ethnic group

adjective denoting or deriving from or distinctive of the ways of living built up by a group of people; - J.F.Kennedy

adjective not acknowledging the God of Christianity and Judaism and Islam

originFrom Middle English ethnik, from Latin ethnicus ("pagan", "heathen"), from Ancient Greek ἐθνικός (ethnikós, “of or for a nation, heathen”), from ἔθνος (éthnos, “a company", later "a people or nation, heathens”). By surface analysis, ethno- + -ic.

Etymology from Wiktionary, CC BY-SA 3.0