IPA: /dɪˈpɑːrtˌmɛntəl/
KK: /dɪˈpɑrtˌmɛntəl/
Relating to a specific division or section within an organization, such as a business or government.
The departmental meeting will discuss the new policies for the sales team.
Departmental → It is formed from "department" (from Old French *departement*, meaning division or separation) and "-al" (meaning relating to). The word "departmental" refers to something that is related to a division or a specific area within an organization.
Think of a 'division' ('department') and how 'relating to' ('-al') describes something connected to that division. This helps you remember that 'departmental' refers to matters concerning a specific division.