(eng): The paper proposes a new definition of entropy of basic probability assignments (BPA) in the Dempster-Shafer (D-S) theory of belief func­tions, which is interpreted as a measure of total uncertainty in the BPA. A list of five desired properties of entropy for D-S belief func­tions theory is stated that are motivated by Shannon's definition of entropy of probability functions, together with the implicit requirement that any definition should be consistent with the semantics of D-S belief functions theory.