kava Syllabification: (ka·va)Pronunciation: /ˈkävə/ (also kava-kava)Definition of kava noun 1a narcotic sedative drink made in Polynesia from the crushed roots of a plant of the pepper family. 2the Polynesian shrub from which the kava root is obtained. Piper methysticum, family Piperaceae Origin: late 18th century: from Tongankava in other Oxford dictionaries Definition of kava in the British & World English dictionary