A communications system that transmits and receives simple unmodulated electric impulses, especially one in which the transmission and reception stations are directly connected by wires. A message transmitted by telegraph; a telegram. To transmit (a message) by telegraph. To send or convey a message to (a recipient) by telegraph. To make known (a feeling or an attitude, for example) by nonverbal means: telegraphed her derision with a smirk. To make known (an intended action, for example) in advance or unintentionally: By massing troops on the border, the enemy telegraphed its intended invasion to the target country. To send or transmit a telegram.