A more thorough explanation:

Definition: A requisitionist is someone who makes a formal demand for something to be done or returned. This could be for the performance of an obligation or the return of a fugitive.

For example, a state governor might make a requisition for another state to surrender a fugitive. This is an authoritative and formal demand that the other state must comply with.

Another example could be a government's requisition of property during an emergency. This means that the government seizes the property for the greater good of the community.

These examples illustrate how a requisitionist is someone who has the authority to demand something and expects it to be fulfilled.