1. noun /ˈsɪɡn(ə)l/
a) An indication given to another person.
I cannot get a signal.
b) An on-off light, semaphore, or other device used to give an indication to another person.
2. verb /ˈsɪɡn(ə)l/
To indicate.
3. adjective /ˈsɪɡn(ə)l/
Standing above others in rank, importance, or achievement.
See Also: signature
Wikipedia foundation.