1. 增加量;增长额
An increment in something or in the value of something is an amount by which it increases.

2. (某一固定时期后自动的)加薪
An increment is an amount by which your salary automatically increases after a fixed period of time.

1. the amount by which something increases

e.g. they proposed an increase of 15 percent in the fare

Synonym: increase

2. a process of becoming larger or longer or more numerous or more important

e.g. the increase in unemployment
the growth of population

Synonym: increasegrowth