necessitate 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. cause to be a concomitant
   necessitate