Definition of postulates:
(n) :
Something assumed without proof as being self-evident or generally accepted, especially when used as a basis for an argument. Sometimes distinguished from axioms as being relevant to a particular science or context, rather than universally true, and following from other axioms rather than being an absolute assumption.
(v) :
To assume as a truthful or accurate premise or axiom, especially as a basis of an argument.
(n) :
A fundamental element; a basic principle.
(n) :
A requirement; a prerequisite.
(n) :
(logic) An axiom.
(adj) :
Postulated.