postulate in WordNet English dictionary

1. require as useful, just, or proper
   "It takes nerve to do what she did"; "success usually requires hard work"; "This job asks a lot of patience and skill"; "This position demands a lot of personal sacrifice"; "This dinner calls for a spectacular dessert"; "This intervention does not postulate a patient's consent"
   necessitate  ask  postulate  need  require  take  involve  call for  demand 
   
2. maintain or assert
   "He contended that Communism had no future"
   contend  postulate 
   
3. take as a given; assume as a postulate or axiom
   "He posited three basic laws of nature"
   postulate  posit 
   

1. (logic) a proposition that is accepted as true in order to provide a basis for logical reasoning
   postulate  posit