turnstile

noun

Etymology: Etymology tree Proto-Indo-European *terh₁- Proto-Indo-European *-nos Proto-Indo-European *tórh₁nos Proto-Hellenic *tórnos Ancient Greek τόρνος (tórnos)bor. Latin tornus Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Italic *-āō Latin -ō Latin tornōbor. Proto-West Germanic *turnēn Old English turnian ▲ Latin tornō Old French tornerbor. Middle English turnen English turn Proto-Indo-European *steygʰ- Proto-Indo-European *-eti Proto-Indo-European *stéygʰeti Proto-Germanic *stīganą Proto-West Germanic *stīgan Proto-West Germanic *-i Proto-West Germanic *stigi Proto-Indo-European *-lósder.? Proto-Indo-European *-tḗr Proto-Indo-European *-tromder.? Proto-Germanic *-ilaz Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Germanic *-ō Proto-Germanic *ilō Proto-West Germanic *-ilu Proto-West Germanic *stigilu Old English stiġel Middle English stile English stile English turnstile From turn + stile.

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.

   “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. 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)" or "give(s)". )