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in·ter·union | \ ˌin-tər-ˈyün-yən 
\
\variants:
or inter-union
Definition of interunion
: existing or occurring between two or more unions More generally, interunion rivalry has been blamed for undermining labor movement solidarity …— Mark Harcourt and Helen Lam : including members of two or more unions
an interunion council
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Time Traveler for interunion
The first known use of interunion was in 1893
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