"departmental meeting" are correct. But which is
In fact, generally speaking, if the noun that
serves as an adjective actually has an adjective form,
it's better to use the adjective form?
E.g. "transition period" vs "transitional period"
"teenager problem" vs "teenage problem"
department meeting = meeting of the department
departmental meeting = the meeting is regarding the ins and outs of the department.
Normally it is not wrong to use either one, because the meeting of the department is closely related to issues about the management of the department hah.
People are waiting to help.
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