carbonate Syllabification: (car·bo·nate)Definition of carbonate noun Pronunciation: /ˈkärbənət, -ˌnāt/ Chemistry a salt of the anion CO32, typically formed by reaction of carbon dioxide with bases. verb Pronunciation: /ˈkärbəˌnāt/ [with object] dissolve carbon dioxide in (a liquid). Chemistry convert into a carbonate, typically by reaction with carbon dioxide. Derivatives carbonationPronunciation: /ˌkärbəˈnāSHən/ noun carbonate in other Oxford dictionaries Definition of carbonate in the British & World English dictionary