set used to broadcast radio or tv signals
"The old television sender was repaired so it could once again broadcast clear images to every living room in the town."
Someone who sends.
"The sender typed the email quickly before hitting send."
A surname, from German from a German municipality of Senden or pet form of Alexander.
"The genealogical records indicate that Sender is likely a surname derived either from the German municipality of Senden or as a pet form of Alexander."
The word sender is formed by adding the suffix -er to the verb send. It was first used to describe a person or thing that performs the action of sending something.