Longman Dictionary of Contemporary English homepage

Topic: TRAINS, RAILWAYS

Date: 1300-1400
Language: Old French
Origin: signale, from Medieval Latin, from Late Latin signalis 'of a sign', from Latin signum; SIGN1

signal

1 noun
     
sig‧nal1 S3 W2 [countable]
1 a sound or action that you make in order to give information to someone or tell them to do something
signal (for somebody) to do something
When she got up from the table, it was obviously the signal for us to leave.
The headmaster gave the signal to begin.
At a pre-arranged signal the lights went out.
smoke signal
2 an event or action that shows what someone feels, what exists, or what is likely to happen
signal (that)
These results are a signal that the child may need special help.
signal of
The opinion poll is a clear signal of people's dissatisfaction with the government.
The display flashed a red warning signal.
A red flag is often used as a danger signal.
send/give a signal
This will send the wrong signal to potential investors.
3TCB a series of light waves, sound waves etc that carry an image, sound, or message, for example in radio or television
send (out)/transmit/emit a signal (to somebody)
This new pay-TV channel sends signals via satellite to cable companies.
In the 1970s it was illegal to transmit fax signals via the public telephone system.
receive/pick up/detect a signal
a small antenna which receives radio signals
The Coast Guard picked up a distress signal from a freighter 50 miles out at sea.
4TTT a piece of equipment with coloured lights, used on a railway to tell train drivers whether they can continue or must stop:
a stop signal
a signal failure (=when these lights do not work)

➔ busy signal

at busy1 (4)
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