/
ˈɪŋkrɪm(ə)nt/
n.
  - an increase or addition, especially one of a series on a fixed scale. 
▸a regular increase in salary on such a scale.
 - Mathematics  a small positive or negative change in a variable quantity or function.
 
Derivative
- incremental adj.
  - incrementally adv.
 
Etymology
ME: from L. incrementum, from the stem of increscere (see increase).