Word Study
octennial
CIDE DICTIONARY
octennial, a. [L. octennium a period of eight years; octo eight + annus year.].
Happening every eighth year; also, lasting a period of eight years. [1913 Webster]
OXFORD DICTIONARY
octennial, adj.
1 lasting eight years.
2 occurring every eight years.
1 lasting eight years.
2 occurring every eight years.
Etymology
LL octennium period of eight years (as OCT-, annus year)
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