turnstile

[turn-stahyl] /ˈtɜrnˌstaɪl/
noun
1.
a structure of four horizontally revolving arms pivoted atop a post and set in a gateway or opening in a fence to allow the controlled passage of people.
2.
a similar device set up in an entrance to bar passage until a charge is paid, to record the number of persons passing through, etc.
Origin
1635-45; turn + stile1
Examples from the web for turnstile
  • From there to the subway, where a wave of another smart card over a turnstile pays the fare.
  • Buzz for entry and place your order at the elaborate turnstile designed to let the nuns maintain their privacy.
  • Many of the houses in the area even had a turnstile as an entry to keep the curious horses from sneaking in for a snack.
  • In the camp store the first section you come to through the turnstile is the liquor department.
  • When card carriers go through a turnstile, they're verified without any travel information being transmitted back to the company.
  • If you make a concerted effort to arrest turnstile-jumpers, you'll find that you're catching serious bad guys in the process.
  • Retrieve your ticket after you place it into the turnstile as you cannot exit without it.
  • By next year, subway riders will use only electronic fare cards at the turnstile.
  • Anyone with a disabled parking permit who parks on the street at a turnstile meter will continue to park for free.
  • Go through the turnstile and take stairs to your right.
British Dictionary definitions for turnstile

turnstile

/ˈtɜːnˌstaɪl/
noun
1.
a mechanical gate or barrier with metal arms that are turned to admit one person at a time, usually in one direction only
2.
any similar device that admits foot passengers but no large animals or vehicles
3.
(logic) Also called gatepost. a symbol of the form ̃⊢, ⊨, or ⊩, used to represent logical consequence when inserted between expressions to form a sequent, or when prefixed to a single expression to indicate its status as a theorem
Word Origin and History for turnstile
n.

1640s, from turn (v.) + stile (n.).