adj, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The 3,000th anniversary of an event or happening.

Adjective

1. 1
   Occurring every three thousand years not-comparable

Etymology

From Latin trimillennialis, from tri- + mill- (“thousand”) + Latin enni(us) (“year”) + -al.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.