Naming 1, 2, 3… millenial celebrations

Question

I know that after 100 years there are centennial celebrations, after 200 years bicentennial, tricentennial, etc.,

Similarly, are there terms for 2000, 3000, et.c., years of celebration?

Answer 1

Yes, there are, and they follow the same naming convention:

bimillennial, trimillennial, etc.

Answer 2

Sure. Picking up where you left off, we have:

• 250 years - Sestercentennial
• 300 years - Tercentennial
• 400 years - Quadricentennial
• 500 years - Quincentennial
• 600 years - Sexcentennial
• 700 years - Septcentennial
• 800 years - Octocentennial
• 900 years - Nonacentennial
• 1000 years - Millennial
• 2000 years - Bimillennial

Anything beyond bimillenial is probably very uncommon at best, but you could likely follow the above naming convention and be understood. See more odd usages here.

Answer 3

Those would be millennial celebrations.

Party like it's 2999!

Answer 4

For a thousand years, the word is millennial. For two thousand years, the word is bimillennial. See this Wikipedia article on anniversary names. I would imagine the same pattern goes for the higher thousands, e.g. trimillennial, quadrimillennial, and so forth.