Lingua Franca
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Definition from the Era
(The information in this section is from the 1771 edition of the Encyclopedia Britannica. Please do not make edits to this section. Content is presented in its original form as to spelling and grammar use. This is what an educated person of Aubrey and Maturin's time would have known)
A kind of jargon spoken on the Mediterranean and particularly throughout the coasts and parts of the Levant, composed of Italian, Spanish, French, vulgar Greek, and other languages. (C-L pg 630)