necessitate

necessitate (http://definr.com/necessitate)

     v 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" [syn: ask, need,
           require, take, involve, call for, demand]
          [ant: obviate]
     2: cause to be a concomitant