How to say "telecommunications" in Japanese

• 交信こうしんCommon
  noun, suru verb, intransitive verbCovers the sense of exchanging messages back and forth, especially by radio between ships, aircraft or operators; it is not the word for the telecommunications industry or technology as a whole.
  交信こうしんが出来できません。↗

  I just can't seem to make contact.
• 電気通信でんきつうしんCommon
  nounThe precise term for telecommunications as a technology, service or industry — telephone and data networks — rather than for a single act of communicating with someone.
• 通信つうしんJLPT N3approx.Common
  noun, suru verb, transitive verb, intransitive verbThe broadest of the three: communication or transmission in general, written correspondence, and news dispatches; reach for it when 'telecommunications' means conveying information rather than naming the industry.
  彼かれは、無電むでんで通信つうしんを送おくった。↗

  He sent a message by wireless.

Use 電気通信 for telecommunications as a technical field or industry, 交信 for a two-way exchange of messages such as radio contact, and 通信 for communication, transmission, correspondence or news in general.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 交信こうしんtelecommunications
• 電気通信でんきつうしんtelecommunications
• 通信つうしんcorrespondence
• 情報通信じょうほうつうしんtelecommunications
• 遠隔通信えんかくつうしんtelecommunications