decennium

[ dih-sen-ee-uh m ]
/ dɪˈsɛn i əm /

noun, plural de·cen·ni·ums, de·cen·ni·a [dih-sen-ee-uh] /dɪˈsɛn i ə/.

a period of ten years; a decade.

Origin of decennium

From Latin, dating back to 1675–85; see origin at decennial

British Dictionary definitions for decennia

decennium

decennary (dɪˈsɛnərɪ)

/ (dɪˈsɛnɪəm) /

noun plural -niums, -nia (-nɪə) or -naries

a less common word for decade (def. 1)

Word Origin for decennium

C17: from Latin, from decem ten + annus year