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

Definition of -ennial

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

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Origin and Etymology of -ennial

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

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a trip made at another's expense

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