Might mean (unverified): Hypothetical chemical element, atomic number 121.
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We found 2 dictionaries that define the word unbiennium:

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  1. unbiennium: Wiktionary
  2. Unbiennium: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (unbiennium)

noun:  The systematic element name for the (as yet undiscovered) chemical element with atomic number 129 (symbol Ube).

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