One of the mysteries of the English language finally explained.
Relating to or involving the number ten, especially as a base of numeration.
Early 17th century; earliest use found in Theophilus Higgons (1578–1659), Church of England clergyman. From post-classical Latin decenarius containing or related to the number ten from decenus ten each, ten at a time, chiefly in plural deceni + classical Latin -ārius.
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