Oaxaca Syllabification: (Oa·xa·ca)Pronunciation: /wäˈhäkə, -ˈKHäkä/Definition of Oaxaca a state in southern Mexico. its capital city; population 265,006 (2005). Full name Oaxaca de Juárez. Oaxaca in other Oxford dictionaries Definition of Oaxaca in the British & World English dictionary