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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Recorded since c.1378, from Old French, from Medieval Latin collaterālis, from Latin col- (“together with”) (a form of con-) + the stem of latus (“side”). By surface analysis, col- + lateral.
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Classic usage
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