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From Ancient Greek ἀριθμητικός (arithmētikós, “arithmetical”), from ἀριθμός (arithmós, “number, counting”), from Proto-Indo-European *h₂ ri-d ʰh₁-mó-s, form of *h₂ rey- (“to count, reason”).

arithmēticus (feminine arithmētica, neuter arithmēticum); first/second-declension adjective

First/second-declension adjective.

	masculine	feminine	neuter	masculine	feminine	neuter
	singular			plural
nominative	arithmēticus	arithmētica	arithmēticum	arithmēticī	arithmēticae	arithmētica
genitive	arithmēticī	arithmēticae	arithmēticī	arithmēticōrum	arithmēticārum	arithmēticōrum
dative	arithmēticō	arithmēticae	arithmēticō	arithmēticīs
accusative	arithmēticum	arithmēticam	arithmēticum	arithmēticōs	arithmēticās	arithmētica
ablative	arithmēticō	arithmēticā	arithmēticō	arithmēticīs
vocative	arithmētice	arithmētica	arithmēticum	arithmēticī	arithmēticae	arithmētica

“arithmeticus”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
"arithmeticus", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“arithmeticus”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.

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