What does telegraph mean?
Telegraph originally meant a system for transmitting coded messages over long distances, especially through electrical signals carried by wires. It became one of the defining communication technologies of the nineteenth century, allowing news, military information, and private messages to travel far faster than postal correspondence. The word also came to refer to the devices and the messages sent through the network. Although the literal system has largely been replaced by telephones, radio, and digital communication, “telegraph” survives in historical writing and in expressions such as “by telegraph.” In modern figurative use, the verb means to reveal an intention or plan before one intends to, often through facial expression, behavior, or an obvious mistake. The word is therefore both a reminder of a once-transformative technology and a useful description of communication that unintentionally gives something away.
A system or device for transmitting coded messages over long distances, especially by electrical signals along a wire; also, historically, a message sent by this method.
"A telegraph carried the official announcement across the country within hours."
Most modern uses are historical or refer to the nineteenth- and early twentieth-century technology. The word can denote the system, the device, or an individual message, depending on context.
To send a message by telegraph; figuratively, to reveal one's intentions or plans in advance, often unintentionally.
"His raised eyebrows telegraphed his disagreement."
The literal verb is now largely archaic. The figurative sense is current and commonly implies that a person's intentions or feelings have become apparent.
The plural is used for separate telegraph devices or systems and can also refer to individual messages sent by telegraph.
"The museum preserves several nineteenth-century telegraphs."
Telegraph comes from Greek roots meaning “far-writing” — a fitting name for a technology that carried words across great distances before telephones and email.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does telegraph come from?
Telegraph comes from French télégraphe, built from Greek roots meaning “far” and “to write.” It entered English in the early nineteenth century as the name for a system capable of transmitting encoded messages over long distances. Its close relatives, including telegram, telegraphy, and telegraphic, preserve the same combination of ideas: communication across distance. The word is closely associated with the electrical telegraph systems that transformed nineteenth-century communication.
Related word forms
How telegraph is actually used
The noun is now chiefly historical, though it remains common in discussions of the nineteenth and early twentieth centuries. The literal verb is largely archaic; in modern figurative use, it usually suggests that someone has unintentionally revealed a plan or intention through their behavior.
Easily confused with telegraph
A telegraph is the communication system or device, whereas a telegram is an individual message sent through such a system.