millénaire
millennium
noun mee-leh-NEHR Rare
Origin: Latin millenarium (thousand years)
Usage Note
Millénaire can be a noun (a millennium, a thousand-year period) or an adjective meaning 'thousand-year-old, ancient' — une tradition millénaire is an age-old tradition. As a noun it is masculine; as an adjective it is invariable in gender but agrees in number. The turn of the year 2000 is often called le passage au nouveau millénaire.
Examples
"Cette forêt est millénaire."
Natural Translation
This forest is thousands of years old.
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