monokini Syllabification: (mon·o·ki·ni)Pronunciation: /ˈmänəˌkinē/Definition of monokini noun a woman’s one-piece beach garment equivalent to the lower half of a bikini. Origin: 1960s: from mono- 'one' + a shortened form of bikini (the first syllable misinterpreted as bi- 'two')monokini in other Oxford dictionaries Definition of monokini in the British & World English dictionary