IPA: /nɒnˌdɪpɑːrˈtmɛntəl/
KK: /nɑnˌdɪˈpɑrtˌmɛntəl/
Not related to a specific department or area of study.
The committee made a nondepartmental decision that affected all teams equally.
Nondepartmental → It is formed from "non-" (meaning not) and "departmental" (from "department" which comes from Old French *departement*, meaning a division or section). The word "nondepartmental" means not related to or not part of a specific department or division.
Think of 'non-' meaning not, and 'departmental' referring to a division. This helps you remember that 'nondepartmental' means something that is not part of a specific division.