The story
From the addition of Mediterranean to distinguish the particular sense of Lingua Franca from generic uses of the term.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Sabir, the pidgin Italian-based lingua franca spoken along the Mediterranean to facilitate trade from the 11th to the 19th centuries. Full definition →
From the addition of Mediterranean to distinguish the particular sense of Lingua Franca from generic uses of the term.
Etymology from Wiktionary, CC BY-SA 4.0.