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    • 1. transmit information or instructions by means of a gesture, action, or sound: "hold your fire until I signal"
  2. 4 days ago · A signal is a gesture, sound, or action which is intended to give a particular message to the person who sees or hears it. They fired three distress signals. As soon as it was dark, Mrs Evans gave the signal. You mustn't fire without my signal. Synonyms: cue, sign, nod, prompting More Synonyms of signal. 2. verb.

  3. communicate by means of an action, gesture, or sound. “The diner signaled the waiters to bring the menu”. synonyms: sign, signalise, signalize. see more. verb. be a signal for or a symptom of. “The economic indicators signal that the euro is undervalued”. synonyms: bespeak, betoken, indicate, point. see more.

  4. a movement, light, or sound that gives information, or tells people what to do: At a signal from their teacher, the children all held up their flags. Don't move until I give the signal. Fewer examples. That light is a signal that the studio is being used. The flare was a signal that the ship was in trouble.

  5. a series of electrical waves that carry sounds, pictures or messages, for example to a radio, television or mobile phone. radio signals. TV signals. a digital signal. a high-frequency signal. a radar signal. to emit a signal. to detect/pick up signals. I couldn't get a signal on my phone.

  6. signal. noun. /ˈsɪɡnəl/ a movement or sound that you make to give someone information, instructions, a warning, etc. synonym sign a danger/warning/distress etc. signal At an agreed signal they left the room. The siren was a signal for everyone to leave the building. When I give the signal, run!

  7. 1. To make a signal to: I signaled the driver to proceed. 2. To relate or make known by signals: They have signaled their willingness to negotiate. 3. To cause an effect in (a cell) by the activation of a receptor, as by a neurotransmitter or hormone. v.intr. To make a signal or signals.

  8. technical. a : a message, sound, or image that is carried by waves of light or sound. The video/TV signal is scrambled. Satellite dishes receive television signals. a digital signal. The transmitter beams radio signals into space. b : a wave of light or sound that carries a message, sound, or image.

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