signal
英 ['sɪgn(ə)l]
美['sɪgnl]
	    - n. 信号;暗号;导火线
 - vt. 标志;用信号通知
 - adj. 显著的;作为信号的
 - vi. 发信号
 - n. (Signal)人名;(瑞典)西格纳尔
 
英英释意
- 1. any communication that encodes a message;
 - "signals from the boat suddenly stopped"
 
- 2. any incitement to action;
 - "he awaited the signal to start"
 - "the victory was a signal for wild celebration"
 
- 3. an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes