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

    e.g. The average yearly increment in labour productivity in industry was 4.5 per cent...
           工业劳动生产率年平均增长 4.5%。
    e.g. Each increment of knowledge tells us more of our world.
           知识的点滴增长都会增进我们对世界的认知。

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.

    e.g. Many teachers qualify for an annual increment.
           许多老师都有资格获得每年的加薪。