WordReference Random House Learner's Dictionary of American English © 2015
sem•a•phore /ˈsɛməˌfɔr/USA pronunciation   n., v., -phored, -phor•ing. 

n. 
  • Telecommunications[uncountable] a system of signaling, esp. one by which a flag is held in each hand and various positions of the arms indicate specific letters, etc.
  • [countable] an apparatus used in this system.

  • v. 
  • Telecommunicationsto signal by semaphore: [+ object]to semaphore a message.[no object]busily semaphoring to the other ship.

  • WordReference Random House Unabridged Dictionary of American English © 2015
    sem•a•phore  (semə fôr′, -fōr′), 
    n., v., -phored, -phor•ing. 

    n. 
  • Telecommunicationsan apparatus for conveying information by means of visual signals, as a light whose position may be changed.
  • Telecommunicationsany of various devices for signaling by changing the position of a light, flag, etc.
  • Telecommunicationsa system of signaling, esp. a system by which a special flag is held in each hand and various positions of the arms indicate specific letters, numbers, etc.

  • v.t., v.i. 
  • Telecommunicationsto signal by semaphore or by some system of flags.
  • Etymology:1810–20; Greek sêma sign + -phore
    sem•a•phor•ic  (sem′ə fôrik, -for-), 
    sem′a•phori•cal, adj. 
    sem′a•phori•cal•ly, adv. 


    Collins Concise English Dictionary © HarperCollins Publishers::

    semaphore /ˈsɛməˌfɔː/ n
    1. an apparatus for conveying information by means of visual signals, as with movable arms or railway signals, flags, etc
    2. a system of signalling by holding a flag in each hand and moving the arms to designated positions to denote each letter of the alphabet
    vb
    1. to signal (information) by means of semaphore
    Etymology: 19th Century: via French, from Greek sēma a signal + -phore

    semaphoric /ˌsɛməˈfɒrɪk/, ˌsemaˈphorical adj



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