Origin of denary
- Latin dēnārius from dēnī by tens dekm̥ in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From the Middle English denarie, from the Latin dēnārius, used elliptically for dēnārius nūmus (“denary coin”, “coin containing ten asses”). Compare etymology 2 below.
- First attested in 1577; from the Latin dēnārius (“containing ten”), from denī (“ten each”, “ten at a time”) + -ārius (whence the English suffix -ary).