tri·en·ni·um (tr - n  - m)n. pl. tri·en·ni·ums or tri·en·ni·a (- n-) A period of three years. [Latin : tri-, tri- + annus, year; see at- in Indo-European roots.] |
triennium [traɪˈɛnɪəm]
n pl -niums, -nia [-nɪə]
a period or cycle of three years
[from Latin, from tri- + annus a year]
Triennium a period of three years, 1847.
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