/ˌɪntəˈlɒkjʊtər/
[noun] A person who takes part in a conversation or dialogue, especially in a formal or official discussion. The word is often used to describe someone who acts as a go-between or spokesperson in negotiations.
This word literally means someone who 'speaks between' — making every conversation a kind of legal interruption.
At the heart of 'interlocutor' lie two ancient Latin pieces that fit together like a lock and key. The first is the prefix 'inter-', meaning 'between' or 'among', which the Romans used constantly to describe things happening in the middle of other things. The second is 'loqui', a Latin verb meaning 'to speak'. From 'loqui' came the noun 'locutio', meaning 'a speaking' or 'a speech', and then 'interlocutio', the act of speaking in between or interrupting. The full agent noun — describing the person who does this — became 'interlocutor', literally 'one who speaks between'.
The Romans used 'interlocutio' in a very specific legal context. In Roman law, an 'interlocutio' was an intermediate ruling made by a judge during a trial — not the final verdict, but a provisional decision delivered mid-proceeding. It was a word belonging to the courtroom, to the world of advocates and magistrates, and it carried the weight of official procedure. This legal flavour clung to the word for centuries before it broadened out into everyday use.
The word entered English in the 16th century, arriving through the influence of Renaissance legal and scholarly Latin rather than through French — a reminder that educated Europeans of that era still communicated directly in Latin across national boundaries. Early English uses in the 1500s retained the courtroom sense, referring to an intermediate or provisional judgment. Soon, however, writers began using it more loosely to mean simply a participant in a dialogue, particularly in written dialogues or formal debates that were a popular literary form at the time.
By the 17th and 18th centuries, 'interlocutor' had fully shed its strictly legal skin. Philosophers, dramatists, and essayists used it to label any named speaker in a scripted conversation — the characters in a Platonic-style dialogue might be referred to as 'the interlocutors'. This was the golden age of published dialogues as a way of exploring ideas, and the word became a natural tool for describing the participants. It also entered the world of theatre and performance, where in 19th-century American minstrel shows, the 'interlocutor' was the straight-talking central figure who directed the show and exchanged jokes with performers on either side.
In modern usage, 'interlocutor' most often appears in diplomatic, journalistic, and political writing, where it describes a person through whom negotiations are conducted — a trusted go-between, a representative who carries messages across a divide. Diplomats seeking to open talks with a foreign government will search for a reliable 'interlocutor', someone positioned to speak on behalf of the other side. The word retains its old sense of being 'between': not fully on either side, but bridging the space where communication happens. Its Latin root 'loqui' also gave English a rich family of words: Latin 'loqui' → English 'loquacious' (meaning very talkative), Latin 'eloqui' → English 'eloquent' (speaking with great skill and clarity), Latin 'colloqui' → English 'colloquy' and 'colloquial' (relating to informal conversation), and Latin 'soliloqui' → English 'soliloquy' (speaking alone to oneself, as on a stage). In every case, the ancient Roman act of speaking — 'loqui' — pulses quietly at the core.