IPA: /ˌɪntərdɪˈvɪʒənl/
KK: /ɪntərdɪˈvɪʒənl/
Relating to or occurring between different divisions of an organization or system.
The interdivisional meeting helped improve communication between departments.
Interdivisional → It is formed from "inter-" (meaning between) and "divisional" (from "dividere" meaning to divide). The word describes something that exists or occurs between divisions or departments.
Think of things that happen 'between' ('inter-') different 'divisions' — that's what interdivisional means.