noun 1.a state in Malaysia, on the SW Malay Peninsula: formerly a part of the British Straits Settlements and of the Federation of Malaya. 640 sq. mi. (1658 sq. km).
2.a seaport in and the capital of this state.
3.a strait between Sumatra and the Malay Peninsula. 35–185 miles (56–298 km) wide.
Related forms Ma·lac·can, adjective, noun