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vigentennial

[vahy-jen-ten-ee-uh l]
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noun
  1. a 20th anniversary.
  2. a celebration, meeting, reunion, etc., commemorating such an anniversary.

Origin of vigentennial

< Latin vīgēn(ī) twenty each + (cen)tennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018