increment

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

     n 1: a process of becoming larger or more numerous or more
          important; "the increase in unemployment"; "the growth
          of population" [syn: increase, growth] [ant: decrease,
           decrease]
     2: the amount by which something increases; "they proposed an
        increase of 15 percent in the fare" [syn: increase]
        [ant: decrease]