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Classic usage
Reading level: medium
Estimated CEFR level: B1 — Intermediate
Estimated from word frequency; not an official CEFR classification.
Attested from the 1610s; borrowed from Latin seriēs, from serere (“to join together, bind”), ultimately from Proto-Indo-European *ser- (“to bind, put together, to line up”). Related to desert, insert, sermon, and sorcerer.
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tap / space
Classic usage
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