trieteric

trieteric

(ˌtraɪɪˈtɛrɪk)
adj
archaic occurring once every three years
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

trieteric

1. a festival that occurs every third year, especially one honoring Bacchus.
2. occurring every third year, particularly in reference to festivals for divinities. — trieterical, adj.
See also: God and Gods
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
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(76) The two appear to have had some relationship with each other since it is known that the same agonothetes presided over both festivals, and the Isthmian Games (trieteric) preceded the Caesarea (pentaeteric).