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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

First Known Use of interunion

1893

in the meaning defined above

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