IPA: /ˈkjuːmjʊlətɪvnəs/
KK: /ˈkjuːmjʊlətɪvnəs/
The quality or state of increasing or building up over time, often referring to the accumulation of something.
The cumulativeness of the data showed a clear trend over the years.
Cumulativeness → It is formed from "cumulus" (from Latin *cumulus*, meaning heap or mass) and the suffix "-ness" (meaning the state or quality of). The word refers to the state of being cumulative or characterized by accumulation.
Think of a 'heap' or 'mass' ('cumulus') that grows over time, which helps you remember that 'cumulativeness' means the quality of accumulating.