Might mean (unverified): Ten thousand year anniversary celebration.
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We found one dictionary that defines the word decamillennial:

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  1. decamillennial: Wiktionary

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Definitions from Wiktionary (decamillennial)

▸ adjective:  Occurring every ten thousand years.

Similar:
millennial, decennial, quadrimillennial, bimillennial, trimillennial, decadal, undecennial, decennal, centenary, vicennial, more...

Opposite:
millennium, century, decade

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Similar:
millennial, decennial, quadrimillennial, bimillennial, trimillennial, decadal, undecennial, decennal, centenary, vicennial, more...

Opposite:
millennium, century, decade



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