Campeche Syllabification: (Cam·pe·che)Pronunciation: /kämˈpāCHā, kamˈpēCHē/Definition of Campeche a state in southeastern Mexico, on the Yucatán Peninsula. its capital, a seaport on the Gulf of Mexico; population 238,850 (2005). Campeche in other Oxford dictionaries Definition of Campeche in the British & World English dictionary