vigentennial: Meaning and Definition of

vi•gen•ten•ni•al

Pronunciation: (vī"jen-ten'ē-ul), [key]
— n.
  1. a 20th anniversary.
  2. a celebration, meeting, reunion, etc., commemorating such an anniversary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.