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Meaning of triannual

tri•an•nu•al

Pronunciation: (trī-an'y-ul), [key]
— adj.
  1. done, occurring, issued, etc., three times a year.
  2. triennial.
—n.
  1. a triannual publication, contest, etc.
  2. triennial.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.