Signal ( noun , verb )

(As a noun)

Signal ( noun )

1. A gesture, action, or sound that conveys a message or instruction.
2. A device or system used to convey information by electronic or mechanical means, such as a light, flag, horn, or siren.
3. A feature of a system or process, such as a change in temperature, that indicates a particular condition or state.
4. A sound or series of sounds emitted by a bird or other animal as a means of communication.

Origin:

Late middle english: from latin signalis, from signum "mark, token".

Examples:

1. He gave the signal to start the race.
2. The traffic lights are a signal for drivers.
3. A rise in temperature is a signal of fever.
4. The bird's song is a signal of mating season.
5. The signal was too weak to get a clear message.

(As a verb)

Signal ( verb )

1. A gesture, action, or sound that conveys a message or instruction.
2. A device or system used to convey information by electronic or mechanical means, such as a light, flag, horn, or siren.
3. A feature of a system or process, such as a change in temperature, that indicates a particular condition or state.
4. A sound or series of sounds emitted by a bird or other animal as a means of communication.

Origin:

Late middle english: from latin signalis, from signum "mark, token".

Examples:

1. He gave the signal to start the race.
2. The traffic lights are a signal for drivers.
3. A rise in temperature is a signal of fever.
4. The bird's song is a signal of mating season.
5. The signal was too weak to get a clear message.