Definition of semaphore
(Entry 1 of 2)
1
: an apparatus for visual signaling (as by the position of one or more movable arms)
2
: a system of visual signaling by two flags held one in each hand
semaphore
verb
semaphored; semaphoring
Definition of semaphore (Entry 2 of 2)
: to convey (information) by or as if by semaphore
: to send signals by or as if by semaphore
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Merriam-Webster unabridged
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Time Traveler for semaphore
The first known use of semaphore was in 1815
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