Definitions

1. noun

A system of signals, especially visual or sound signals, used for communication over long distances, typically at sea or on railways.

“The lighthouse served as a semaphore to guide ships safely into the harbor.”

2. noun

A mechanical or electrical device for transmitting coded information, such as the position of a flag or the color of a light.

“The radio station used a semaphore to send coded messages to the pilots.”

3. verb

To signal or communicate something, especially in a way that is visible or audible from a distance.

“The sailors semaphored to the shore to ask for assistance.”