- Today's Word
Semaphore
SEM-uh-for
Definition
- (Noun) A system of signaling using flags, lights, or hand movements.
- (Verb) To communicate using such signals.
Example
The sailors used semaphore to convey messages between ships without radios.
Fun Fact
Semaphore was widely used in maritime communication and railway signaling before modern technology. The famous Semaphore Flag Signaling System is still taught in some military and scouting organizations today—so next time your phone dies, maybe it’s time to brush up on your flag-waving skills!
(verb) To suggest or assume something as a basis for reasoning or argument without prior proof.
The scientist postulated that the mysterious signals were coming from a previously undiscovered layer of the atmosphere, a theory that took years to confirm.
Postulate derives from the Latin postulare, meaning “to demand” or “to claim,” rooted in poscere, meaning “to ask urgently.” In medieval logic and mathematics, a postulate was a foundational assumption that didn’t require proof — something demanded to be accepted as a starting point. Euclid’s famous geometric postulates, written around 300 BCE, are among the most influential examples in intellectual history.