Turnstile Definition

tûrnstīl
turnstiles
noun
A post with revolving horizontal bars, placed in an entrance to allow the passage of persons but not of horses, cattle, etc.
Webster's New World
A similar apparatus, often coin-operated, used to admit persons one at a time.
Webster's New World
A similar structure that permits the passage of an individual once a charge has been paid or that counts the number of individuals passing through.
American Heritage

(mathematics, logic, proof theory) The symbol used to represent logical entailment (deducibility relation), especially of the syntactic type, i.e., syntactic consequence. (Such symbol can be read as "proves".)

Comma-separated elements preceding the turnstile should be interpreted as forming a conjunction, whereas comma-separated elements following the turnstile should be interpreted as forming a disjunction.
Wiktionary

Other Word Forms of Turnstile

Noun

Singular:
turnstile
Plural:
turnstiles

Origin of Turnstile

  • turn (rotating) + stile (gate)

    From Wiktionary

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