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in·ter·an·nu·al | \ ˌin-tər-ˈan-yə(-wə)l 
, -yü-əl \
, -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
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Time Traveler for interannual
The first known use of interannual was in 1881
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