A semaphore is a gadget used for conveying signals. Semaphores have either lights or mechanical arms that move.

The word semaphore is related to a Greek word meaning "signal," and that's exactly the purpose of semaphores: they give signals. The place you're most likely to have seen a semaphore is a railroad crossing: the gadget with moving arms is a semaphore. Some semaphores have mechanical arms, while others just use lights to communicate. A semaphore system can also use flags. In all cases, semaphores give visual signals that communicate something important, especially to people traveling.

Definitions of semaphore

n an apparatus for visual signaling with lights or mechanically moving arms

Type of:
apparatus, setup
equipment designed to serve a specific function

v send signals by or as if by semaphore

Type of:
sign, signal, signalise, signalize
communicate silently and non-verbally by signals or signs

v convey by semaphore, of information

Type of:
communicate, intercommunicate
transmit thoughts or feelings

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