denary

From Middle English denarie, from the Latin dēnārius, used elliptically for dēnārius nummus (“denary coin, coin containing ten asses”). Piecewise doublet of etymology 2 below. Doublet of dinar, denar, and denier.

First attested in 1577; from the Latin dēnārius (“containing ten”), from dēnī (“ten each, ten at a time”) + -ārius (whence the English suffix -ary).