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Classic usage
Reading level: medium
Estimated CEFR level: B1 — Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English actyf, from Old French actif, from Latin āctīv(us), from agere (“to do, to act”), ultimately from Proto-Indo-European *h₂éǵeti. By surface analysis, act + -ive.
active agent
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Classic usage
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