octennial
octennial
(ɒkˈtɛnɪəl)adj
1. occurring every eight years
2. lasting for eight years
[C17: from Latin octennium eight years, from octo eight + annus year]
ocˈtennially adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Translations
octennal