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tricennial

American  
[trahy-suhn-ee-uhl] / traɪˈsən i əl /

adjective

  1. relating to, composed of, or taking place every thirty years.

Example Sentences

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Tricennial, trī-sen′i-al, adj. pertaining to thirty years: occurring every thirty years.

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.