noun
organ of public opinion; media outlet
Refers to newspapers, magazines, broadcasters, and other institutions that shape or express public opinion. Often used in formal or journalistic contexts.
新聞は重要な言論機関の一つだ。
Newspapers are one of the important organs of public opinion.
マスコミ is a broader, more casual term for mass media, while 言論機関 specifically emphasizes the role of shaping public opinion.
Compound of 言論 (public discourse, speech) and 機関 (organ, institution). The exact historical derivation is uncertain, but the term has been used since the early 20th century to describe media as a pillar of public opinion.