IPA: /əˈkjuːmjʊlətɪvli/
KK: /əˈkjuːmjʊlətɪvli/
In a way that involves gathering or increasing over time, often referring to the gradual collection of something.
The data was collected accumulatively to show the overall trend over the years.
Accumulatively → It is formed from "accumulare" (meaning to heap up or gather) and the suffix "-ively" (meaning in a manner of). The word describes the manner in which things are gathered or heaped up over time.
Think of 'gathering' ('accumulare') things 'in a manner' ('-ively') — that's how accumulatively means to gather things over time.