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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from Latin pervius (“having a passage through; passable, penetrable, traversable”) + English -ous (suffix denoting the presence of a quality in any degree (typically an abundance)). Pervius is derived from per- (prefix denoting doing something all the way through or entirely) + via (“road, street; method, way; (figurative) course, route”) + -us (suffix forming adjectives)
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Classic usage
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