turnstile

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See also: turn-stile

English[edit]

English Wikipedia has an article on:
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Etymology[edit]

turn +‎ stile

A set of turnstiles in the USA

Pronunciation[edit]

  • (UK) IPA(key): /ˈtɜːnstaɪl/
  • (US) IPA(key): /ˈtɝnstaɪl/
  • (file)

Noun[edit]

turnstile (plural turnstiles)

  1. A rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been paid.
    • 1941 May, “Jubilee of the City Tube”, in Railway Magazine, page 224:
      The fare was fixed at 2d., irrespective of distance, and was paid by passengers on passing through turnstiles at each station.
  2. A similar device in a footpath to allow people through one at a time while preventing the passage of cattle.
  3. (mathematics, logic) The symbol used to represent logical entailment (deducibility relation), especially of the syntactic type; i.e., syntactic consequence. (Such symbol can be read as "prove(s)" [1] or "give(s)". [2])

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References[edit]

  1. ^ “Archived copy”, in (please provide the title of the work)[1], accessed 21 November 2012, archived from the original on 2011-11-09
  2. ^ Kleene, Stephen Cole. Mathematical Logic. Mineola, New York: Dover Publications, 2002. Ch. VI, §48, p. 286.