From Middle English arsmetike, from Old French arismetique, from Latin arithmētica, arithmeticus, from Ancient Greek ἀριθμητική (τέχνη), feminine of ἀριθμητικός, from ἀριθμός, from Proto-Indo-European *h₂ri-dʰh₁-mó-s, form of *h₂rey-. Used in English since 13th century.
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