trigintennial

English

Etymology

From Latin triginta (“thirty”) + -ennium (“forming periods of years”) [from annus (“year”) + -ium (“forming groups”)] + -al (“forming adjectives”).

Adjective

trigintennial (not comparable)

  1. (uncommon) Synonym of tricennial: once every thirty years.

References
  • Oxford English Dictionary, "trigintennial, adj."
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