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-ennial

adjective combining form
-en·​nial | \ ¦enēəl, ¦enyəl\

Definition of -ennial

: recurring at or marking intervals of (so many) years biennial centennial

History and Etymology for -ennial

Middle English -eniale, from Middle French -ennial, from Latin -ennium (as in biennium period of two years) + Middle French -al

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