increment increment /ˈɪnkrəmənt/

noun

1. The amount by which something increases  ( increment , increase )
   the amount by which something increases
    They proposed an increase of 15 percent in the fare
   they proposed an increase of 15 percent in the fare
   
2. A process of becoming larger or longer or more numerous or more important  ( increment , growth , increase )
   a process of becoming larger or longer or more numerous or more important
    The increase in unemployment
   the increase in unemployment
    The growth of population
   the growth of population