1. (noun) signal, signaling, sign
any nonverbal action or gesture that encodes a message
Synonyms: augury, signaling, house, sign, foretoken, planetary house, signboard, signal, sign of the zodiac, preindication, mansion, mark, star sign, polarity
Antonyms: unimpressive
2. (noun) signal
any incitement to action
Synonyms: sign, signaling
Antonyms: unimpressive
3. (adj) signal
an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
Synonyms: sign, signaling
Antonyms: unimpressive
4. (verb) signal
notably out of the ordinary
Antonyms: unimpressive
5. (verb) sign, signal, signalize, signalise
communicate silently and non-verbally by signals or signs
Synonyms: sign, bespeak, indicate, point out, betoken, call attention, bless, signalize, subscribe, signalise, contract, sign on, distinguish, ratify, signal, point, sign up
Antonyms: unimpressive
6. (verb) bespeak, betoken, indicate, point, signal
be a signal for or a symptom of
Synonyms: predict, augur, foreshadow, taper, call for, prognosticate, place, suggest, betoken, show, head, guide, request, foretell, maneuver, auspicate, signalise, point, channelize, level, indicate, channelise, signal, sign, steer, quest, manoeuver, signalize, aim, designate, manoeuvre, portend, direct, bode, charge, luff, presage, repoint, argue, bespeak, target, orient, omen, forecast, sharpen, prefigure
Antonyms: unimpressive
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Synonyms and Antonyms of signal 
