1.a quantity that is added;
there was an addition to property taxes this year
2.a change resulting in an increase;
the increase is scheduled for next month
3.a process of becoming larger or longer or more numerous or more important;
the increase in unemployment
4.the amount by which something increases;
they proposed an increase of 15 percent in the fare
5.the act of increasing something;
he gave me an increase in salary
1.become bigger or greater in amount;
The amount of work increased
2.make bigger or more;
The boss finally increased her salary