from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A visual signaling apparatus with flags, lights, or mechanically moving arms, as one used on a railroad.
- n. A visual system for sending information by means of two flags that are held one in each hand, using an alphabetic code based on the position of the signaler's arms.
- transitive v. To send (a message) or to signal by semaphore.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any visual signaling system with flags, lights, or mechanically moving arms.
- n. A visual system for transmitting information by means of two flags that are held one in each hand, using an alphabetic and numeric code based on the position of the signaler’s arms.
- n. 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.
- v. To signal using (or as if using) a semaphore.
from the GNU version of the Collaborative International Dictionary of English
- n. A signal telegraph; an apparatus for giving signals by the disposition of lanterns, flags, oscillating arms, etc.
from The Century Dictionary and Cyclopedia
- n. A mechanical device for displaying signals by means of which information is conveyed to a distant point.
- To signal with a semaphore; humorously, wave one's arms and signal like a semaphore.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. send signals by or as if by semaphore
- v. convey by semaphore, of information
- n. an apparatus for visual signaling with lights or mechanically moving arms
Greek sēma, sign + -phore.(American Heritage® Dictionary of the English Language, Fourth Edition)
Borrowed in 1816 from French sémaphore, coined in French from Ancient Greek σῆμα (sêma, "sign"), and -φωρος (-phoros), from φέρω (férō, "to bear, carry"). (Wiktionary)