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

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

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Er, tercentennial. –  HaL Apr 8 '11 at 2:32
    
@HaL, tricentennial is okay too, I guess –  CMR Apr 8 '11 at 2:50
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4 Answers 4

up vote 2 down vote accepted

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

bimillennial, trimillennial, etc.

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+1 After you said it, that sounds obvious... :-) –  CMR Apr 8 '11 at 2:25
    
I doubt many of us will be around long enough to need to expand that etc.... –  FumbleFingers Apr 8 '11 at 2:26
    
Perhaps not you & I, but if all goes well this question will still be around in some form or another :) –  e.James Apr 8 '11 at 2:30
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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.

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The 2500 year celebration of the Persian empire by the Shah of Iran in 1971...what would they call that? Sestermillenial? –  Mitch Apr 8 '11 at 2:34
    
@Mitch I'll buy it. –  HaL Apr 8 '11 at 2:35
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Those would be millennial celebrations.

Party like it's 2999!

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+1 for the party comment :) –  e.James Apr 8 '11 at 2:24
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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.

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