sender

/ˈsɛndər/
noun
  1. A person who sends a message, letter, package, or other communication.
    • The sender of the anonymous letter was never identified.
    • The sender forgot to include a return address on the package.
    • In the email, the sender's name appeared at the top of the message.
  2. A device or system that transmits signals, data, or information.
    • The network sender failed, causing a temporary loss of internet connection.
    • The radio sender broadcast the emergency alert across the region.
    • The satellite sender relayed images from space back to Earth.
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