(of a radio, TV, telephone, internet, etc.) An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
“My mobile phone can't get a signal in the railway station.”
A sequence of states representing an encoded message in a communication channel.
adjective
Standing above others in rank, importance, or achievement.
“a signal exploit; a signal service; a signal act of benevolence”