Answer:
"a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals" is oxford definition
Step-by-step explanation:
Oxford languages define telephone as: "a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals"
Wikipedia describes telephone as: "A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user."