How to say "cumulative" in Japanese

• 累積的るいせきてき
  na-adjectiveCovers 'cumulative' as an adjective: something that builds up by accumulation, like effects that pile up over time. Less common; use it when you need an adjective rather than the noun 累積.
• 累加的るいかてき
  na-adjectiveAlso adjectival, stressing that amounts are added on one after another. Less common, and not usually the word you want: for the 'cumulative' idea, 累積 is the common choice.
• 累積るいせきCommon
  prenominal modifierThe common word, covering both 'cumulative' and 'accumulated': the total or amount that has built up, or accumulation as a process. Reach for this when you want the noun sense of 'cumulative'.

For the noun sense — an accumulated total or amount — use the common 累積; 累積的 and 累加的 render 'cumulative' as an adjective, but both are uncommon choices.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 累積的るいせきてきcumulative
• 累加的るいかてきcumulative
• 累積るいせきcumulative