国こく都とMeanings1nounnational capital; capital cityFormal or literary term for a nation's capital. In everyday speech, 首都 (しゅと) is more common.国こく都との防ぼう衛えいは国こっ家かの最さい重じゅう要よう課か題だいの一ひとつである。Defense of the national capital is one of the nation's most critical issues.