interannual

in·ter·an·nu·al

I5198850 (ĭn′tər-ăn′yo͞o-əl)adj. Measured or evaluated on a yearly basis or from one year to the next: interannual variability in plankton abundance.
in′ter·an′nu·al·ly adv.

interannual

(ˌɪntərˈænjʊəl) adjoccurring between two or more years