cir·cuit/`sɜkɪt; ˈsɜːkɪt/ n 1 [C] a circular track or journey 环行线路; 环行: a racing circuit 环形跑道 2 [C] the complete circle that an electric current flows around 电路 3 [singular 单数] all the places that are usually visited by someone who is doing a particular activity 〔为进行某项活动而途经的〕巡回地点: a well known speaker on the international lecture circuit 一位进行国际巡回演讲的著名演讲人