triennial

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From Latin triennium (“three-year period”), from tres (“three”) + annus (“year”). By surface analysis, tri- + -ennial.

The first form in which the encroaching temper of the king was manifested was, in causing the Triennial Bill to be repealed. — A Modern History, From the Time of Luther to the Fall of Napoleon : For the Use of Schools and Colleges, Lord, John

tercentennial, tercentenary

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