ethnonationalist adjective 1noun 1forms 3 adjective1 •Of or pertaining to ethnonationalism.Hungary has effectively become a one-party autocracy, ruled by an ethnonationalist ideology. Poland seems well down the same path. — 2018 noun1 •A proponent of ethnonationalism.As central Party control weakened, independence demands grew in other republike, inspired in part by local ethnonationalisms and fear of living in a Yugoslavia dominated by Serbian ethnonationalists. — 2010 formsethnonationalists · more ethnonationalist · most ethnonationalist