Definitions from Wiktionary ( )

▸ noun:  Any equipment used for visual signalling by means of flags, lights, or mechanically moving arms, which are used to represent letters of the alphabet, or words.
▸ noun:  A visual system for transmitting information using the above equipment; especially, by means of two flags held one in each hand, using an alphabetic and numeric code based on the position of the signaller's arms; flag semaphore.
▸ noun:  (programming) A bit, token, fragment of code, or some other mechanism which is used to restrict access to a shared function or device to a single process at a time, or to synchronize and coordinate events in different processes.
▸ verb:  (ambitransitive, figurative) To signal using, or as if using, a semaphore, with the implication that it is done nonverbally.

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