A sequence of states representing an encoded message in a communication channel. / Any variation of a quantity or change in an entity over time that conveys information upon detection.

(transitive, intransitive) To indicate; to convey or communicate by a signal. / (transitive) To communicate with (a person or system) by a signal.

Standing above others in rank, importance, or achievement.

present participle of signal

the use of signals in communications, especially the sending of signals in telecommunications / (rail transport) the signals and associated equipment required for their operation.

plural of signaler

(US, Canada) simple past tense and past participle of signal

One who signals. / A device that sends a signal.

plural of signaller

(British spelling) One who signals. / (rail transport) synonym of signalman