interunion

adjective
in·​ter·​union | \ ˌin-tər-ˈyün-yən How to pronounce interunion (audio) \
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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The first known use of interunion was in 1893

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