-enni, -ennial, -ennium (Latin: a suffix; year, years).bicentennial:
biennial:
biennium:
centennial:
centennium:
decennary:
decennial:
decennium:
duodecennial:
millennial:
millennium:
novennial:
octennial:
perennial:
quadrennial:
quadrennium:
quadricentennial:
quincentennial:
quindecennial:
quinquenniad:
quinquennial:
quinquennium:
semicentennial:
septennary:
septennate:
septennial:
septennium:
sesquicentennial:
sexennial:
sexennium:
tercentennial:
tricennial:
tricentennial:
triennial:
triennium:
undecennial:
vicennial:
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