Telegraph (noun)

1. A system for sending messages over long distances, typically using Morse code and a series of electrical signals.
2. An apparatus for sending or receiving such messages.

Origin:

From the greek words tele meaning "far" and graphein meaning "to write".

Examples:

1. The telegraph revolutionized communication in the 19th century.
2. The telegraph operator sent a message to the headquarters.
3. The telegraph machine allowed people to send messages to each other in real-time.
4. The telegraph was an important tool during the Civil War.
5. The telegraph was replaced by the telephone and eventually by the internet.