-ennial
occuring periodically, in years:
occuring periodically, in years:
biennial, triennial, bicentennial
-en·nial
\|enēəl, |enyəl\ adjective combining form
Etymology: Middle English -eniale, from Middle French -ennial, from Latin -ennium (as in biennium period of two years) + Middle French -al — more at biennial
: recurring at or marking intervals of (so many) years
< biennial >
< centennial >
< biennial >
< centennial >