This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The 2,000th anniversary of an event or happening.

adj. Occurring every thousand (2,000) years and 2 millennia.

"In an ingenious and thought-provoking paper some time ago, Jerrold Levinson put forward a novel and imaginative thesis purporting to explain why tropism never quite got off the ground, despite its respectable bimillennial launch history (1980)."