interunion
adjective
in·ter·union
ˌin-tər-ˈyün-yən
variants
or inter-union
: 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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Merriam-Webster unabridged
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