turnstile
Synonym discussion
Sense: noun/1
A turnstile is a specific type of entry control: it has short rotating arms that let one person through at a time and is common at paid-entry venues such as subway stations, stadiums, and museums. A gate is a broader term for any hinged or sliding barrier that opens and closes — it does not limit passage to one person at a time, nor does it usually involve payment. A barrier is even more general and can refer to a fence, wall, cone, or rail. A revolving door looks somewhat similar to a turnstile because it also rotates, but it is a full-height glass door meant for continuous traffic in both directions at building entrances; it rarely requires a ticket or coin. For example: 'She swiped her card at the turnstile' (payment + one-person passage), but 'He held the gate open for his friends' (no payment, wider opening), and 'The revolving door spun as people entered the lobby' (full-height, no payment).
Common collocations
Etymology
Turnstile is a compound of 'turn' and 'stile'. A stile is a set of steps that let people climb over a fence or wall. In a turnstile, the arms 'turn' instead of the person climbing, allowing one person to pass at a time. The word has been used in English since the 1600s.