interannual

adjective
in·​ter·​an·​nu·​al | \ˌin-tər-ˈan-yə(-wə)l, -yü-əl\
variants: or less commonly inter-annual

Definition of interannual 

: occurring between, relating to, or involving two or more years : occurring or observed in different years interannual changes in weather patterns

First Known Use of interannual

1881, in the meaning defined above

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The first known use of interannual was in 1881

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