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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
1635-1645
1635-45; turn + stile1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for turn stile

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for turn stile

turnstile

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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4
6
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