telecommunication noun tele·​com·​mu·​ni·​ca·​tion ˌte-li-kə-ˌmyü-nə-ˈkā-shən 1 : communication at a distance (as by telephone) 2 : technology that deals with telecommunication usually used in plural

Telecommunication, often used in its plural form, is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems.

telecommunications noun [ plural ] uk / ˌtel.ɪ.kəˌmjuː.nɪˈkeɪ.ʃ ə nz / us / ˌtel.ə.kəˌmjuː.nəˈkeɪ.ʃ ə nz / (informal telecoms, telecom) Add to word list B2 the sending and receiving of messages over distance, especially by phone, radio, and television:

Telecommunications refers to the exchange of information by electronic and electrical means over a significant distance. A complete telecommunication arrangement is made up of two or more stations equipped with transmitter and receiver devices.

Telecommunications, also known as telecom, is the exchange of information over large distances. It's a broad term that includes various sectors, but all include a transmitter and a receiver. The medium of signal transference can be via various means—fiber, electromagnetic fields, light, cable, etc.