IPA: /ˌɪntəˈreɪdʒənsi/
KK: /ˌɪntərˈeɪdʒənsi/
Relating to or involving multiple agencies, particularly in a government context.
The interagency task force worked together to address the crisis effectively.
Interagency → It is formed from "inter-" (meaning between) and "agency" (from Latin "agens", meaning doing or acting). The word refers to cooperation or interaction between different agencies.
Think of different organizations working 'between' each other ('inter-') to 'act' or 'do' something together, which is what interagency means.