WordReference Random House Learner's Dictionary of American English © 2020
sig•nal /ˈsɪgnəl/USA pronunciation   n., adj., v.,  -naled, -nal•ing or (esp. Brit.) -nalled, -nal•ling. 
n. [countable]
  1. anything that serves to indicate, warn, direct, etc., such as a light, a gesture, or an act:a traffic signal.
  2. an act or event that causes an action:The execution was a signal for revolt.
  3. Electronicsan electrical quantity or effect, as current or waves, that can be varied to convey information:a TV signal.

adj. [before a noun]
  1. serving as a signal:a signal light.
  2. unusual;
    notable;
    outstanding:a signal accomplishment.

v. 
  1. to make a signal to (someone or something): [no object]The police officer stood there signaling.[+ object]The captain said he wanted to signal his ship.[+ object + to + verb]Signal the tugboat to pull up a little closer.[+ that clause]to signal that he wants to come home.
See -sign-.
WordReference Random House Unabridged Dictionary of American English © 2020
sig•nal  (signl),USA pronunciation n., adj., v.,  -naled, -nal•ing or (esp. Brit.) -nalled, -nal•ling. 
n. 
  1. anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.:a traffic signal; a signal to leave.
  2. anything agreed upon or understood as the occasion for concerted action.
  3. an act, event, or the like that causes or incites some action:The unjust execution was the signal for revolt.
  4. a token;
    indication.
  5. Electronicsan electrical quantity or effect, as current, voltage, or electromagnetic waves, that can be varied in such a way as to convey information.
  6. Games[Cards.]a play that reveals to one's partner a wish that he or she continue or discontinue the suit led.

adj. 
  1. serving as a signal;
    used in signaling:a signal flag.
  2. unusual;
    notable;
    outstanding:a signal exploit.

v.t. 
  1. to make a signal to.
  2. to communicate or make known by a signal.

v.i. 
  1. to make communication by a signal or signals.
signal•er;
 esp. Brit.signal•ler, n. 

  • Medieval Latin signāle, Late Latin, noun, nominal use of neuter of signālis of a sign. See sign, -al2, -al1
  • Middle English (noun, nominal) 1350–1400
    • 1, 4.See corresponding entry in Unabridged sign.
    • 8.See corresponding entry in Unabridged unique, exceptional, remarkable, striking.

'signaler' also found in these entries:
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