IPA: /ˌɪntərˈjuːniən/
KK: /ɪntərˈjunɪən/
A blending or combination of different unions or groups, often referring to organizations or associations that work together.
The interunion collaboration led to significant improvements in labor rights.
Interunion → It is formed from "inter-" (meaning between) and "union" (from Latin "unio", meaning unity or oneness). The word describes a state of being united or connected between different entities or groups.
Think of things that are 'between' ('inter-') different groups coming together in 'unity' — that's what interunion means.