semaphore: meaning, definition, pronunciation and examples
LowTechnical / Specialized
Quick answer
What does “semaphore” mean?
A system of sending messages using visual signals, typically with flags or lights.
Audio
Pronunciation
Definition
Meaning and Definition
A system of sending messages using visual signals, typically with flags or lights.
A system of sending information or messages using coded visual signals, such as the movement of arms, flags, or light beams. Also refers to the device or apparatus that produces such signals.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. The term is equally technical in both varieties.
Connotations
Neutral. Connotes historical/maritime communication or modern computing.
Frequency
Rare in everyday conversation in both varieties. More likely encountered in historical contexts or computer science.
Grammar
How to Use “semaphore” in a Sentence
semaphore [message] to [recipient]semaphore that [clause][recipient] semaphored [message]Vocabulary
Collocations
Examples
Examples of “semaphore” in a Sentence
verb
British English
- The lookout semaphored the sighting of land to the bridge.
- They semaphored frantically from the hilltop.
American English
- The scout semaphored a warning to the rest of the troop.
- He semaphored the coordinates using two flags.
adverb
British English
- none standard
American English
- none standard
adjective
British English
- The old semaphore tower still stands on the coast.
- He learned the semaphore alphabet.
American English
- The railway used a semaphore signal system.
- We studied semaphore communication techniques.
Usage
Meaning in Context
Business
Not used.
Academic
Used in historical studies (e.g., naval history) and computer science.
Everyday
Extremely rare. May be used in specific hobbies like scouting.
Technical
Primary context: 1) Railway/historical signalling. 2) Computer science (process synchronization).
Vocabulary
Synonyms of “semaphore”
Vocabulary
Antonyms of “semaphore”
Watch out
Common Mistakes When Using “semaphore”
- Mispronouncing as /ˈsiː.mə.fɔːr/ (like 'see').
- Using it as a general synonym for 'signal'. It specifically implies a coded visual system.
FAQ
Frequently Asked Questions
No, it is a low-frequency, specialized term. Most people encounter it in historical contexts or if they study computer science.
A traffic light is a specific, automated type of visual signal. 'Semaphore' is a broader term for any system of sending messages via coded visual signals, which can include flag positions, arm movements, or mechanical arms on railways.
Yes, though rarely. It means to send a message or signal using a semaphore system (e.g., 'They semaphored a warning').
The computer science term, coined by Edsger Dijkstra, is a metaphor. Just as a railway semaphore controls whether a train can proceed, a software semaphore controls whether a process can proceed by checking a 'signal' (a variable).
A system of sending messages using visual signals, typically with flags or lights.
Semaphore is usually technical / specialized in register.
Semaphore: in British English it is pronounced /ˈsem.ə.fɔːr/, and in American English it is pronounced /ˈsem.ə.fɔːr/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “none”
Learning
Memory Aids
Mnemonic
Think: SEMI-A-PHONE (half a phone) -> a simpler, visual way to communicate over a distance.
Conceptual Metaphor
COMMUNICATION IS VISIBLE PHYSICAL MOVEMENT.
Practice
Quiz
In computer science, what is a 'semaphore' primarily used for?