Meaning of “telephone” - Learner’s Dictionary

telephone

noun us uk /ˈtelɪfəʊn/ also phone
COMMUNICATION [ U ]

A2 a communication system that is used to talk to someone who is in another place:

a telephone call
I'm sorry, he's on the telephone (= using the telephone) at the moment.

More examples

EQUIPMENT [ C ]

A2 a piece of equipment that is used to talk to someone who is in another place:

The telephone rang and she hurried to pick it up.
Could you answer the telephone?

(Definition of “telephone noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)