trimillennial

== English == === Etymology === From Latin trimillennialis, from tri- +‎ mill- (“thousand”) +‎ Latin enni(us) (“year”) +‎ -al. === Noun === trimillennial (plural trimillennials) The 3,000th anniversary of an event or happening. ==== Translations ==== === Adjective === trimillennial (not comparable) Occurring every three thousand years ==== Translations ====