LacedaemonianPronunciation: /ˌlasɪdɪˈməʊnɪən/Definition of Lacedaemonian noun a native or inhabitant of Lacedaemon, an area of ancient Greece comprising the city of Sparta and its surroundings. adjective of Lacedaemon or its inhabitants; Spartan. Lacedaemonian in other Oxford dictionaries Definition of Lacedaemonian in the US English dictionary