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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
In the sense of a person, from Middle English calkelatour (“a mathematician, an astrologer”), borrowed from Latin calculātor, equivalent to calculate + -or. The other meanings arose in Modern English.
reckoner, figurer, estimator, computer
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Classic usage
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