interunion
adjective
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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