unicameral Syllabification: (u·ni·cam·er·al)Pronunciation: /ˌyo͞onəˈkam(ə)rəl/Definition of unicameral adjective (of a legislative body) having a single legislative chamber. Origin: mid 19th century: from uni- 'one' + Latin camera 'chamber' + -alunicameral in other Oxford dictionaries Definition of unicameral in the British & World English dictionary