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Jargon comes from Old French jargoun, meaning “the warbling of birds.” In medieval English it meant “twittering” or “chattering” and also “gibberish”; the modern sense of language used by a particular group and difficult for outsiders to understand had developed by the 17th century.
Etymology
From Middle English jargoun, jargon, from Old French jargon, a variant of gargon, gargun (“chatter; talk; language”).
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