increment
Pronunciation: /ˈɪŋkrɪm(ə)nt/
noun
- an increase or addition, especially one of a series on a fixed scale: all sizes from 4-30 mm in 1 mm increments
- a regular increase in salary on an incremental scale: your first increment will be payable six months from your date of commencement
- Mathematics a small positive or negative change in a variable quantity or function.


Origin:
late Middle English: from Latin incrementum, from the stem of increscere 'grow' (see increase)