ărithmētĭca, ae, and -ē, ēs, f., = ἀριθμητική (sc. τέχνη),
arithmetic , the science of numbers : arithmetica, Sen. Ep. 88; arithmetice, Vitr. 1, 1, and Plin. 35, 10, 36, § 76.
arithmētica ōrum, n , ἀριθμητικά, arithmetic. ...
An Elementary Latin Dictionary