S: (n) requisition (the act of requiring; an authoritative request or demand, especially by a military or public authority that takes something over (usually temporarily) for military or public use)
S: (n) call (a demand for a show of hands in a card game) "after two raises there was a call"
S: (n) margin call, call (a demand by a broker that a customer deposit enough to bring his margin up to the minimum requirement)
S: (n) wage claim, pay claim (the wage demanded from management for workers by their union representatives)