Telephone (noun)

1. A device for transmitting and receiving speech over a distance, typically by means of an electric current passed through a wire.
2. A system for the transmission of sound over a distance, typically by means of an electric current passed through a wire.

Origin:

Early 19th century: from greek tēle "far" + phone "sound", on the pattern of telegraph.

Examples:

1. He answered the telephone.
2. She made a telephone call.
3. The telephone was invented by Alexander Graham Bell.
4. The telephone is an important means of communication.
5. The telephone is a useful tool for business.