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The Collaborative International Dictionary

Tricennial

Tricennial \Tri*cen"ni*al\, a. [L. tricennium thirty years; triginta thirty + annus year: cf. L. tricennalis.] Of or pertaining to thirty years; consisting of thirty years; occurring once in every thirty years.

Wiktionary

tricennial

a. Of or pertaining to thirty years; occurring once in every thirty years.