Antonym for cumulative
Solution 1:
The speedometer provides instantaneous data: it shows the value at that instant.
When using GRIDc data, note that there are two types of data available: Instantaneous and Cumulative.
Temperature is what we call instantaneous data. Instantaneous data does not require manipulation. In other words, at any given time, you can look up the data, and without manipulation, find the exact value you are looking for. Wind speed is another example that fits in the category.
http://www.gridc.net/page/instantaneous-cumulative