accumulate · involve

1. Origins, structure, and basic meaning

• Structure: 累 has 11 strokes and expresses gradual accumulation or adding quantities together.
• Basic usage: 累積 is read るいせき, and 累計 is read るいけい.

2. Common pitfalls and similar expressions

• Accumulation and a running total
  • 長年の疲労が累積し means years of fatigue accumulated.
  • 累積 also applies to things not directly counted, such as fatigue.
  • 週末に累計を出す means calculate the cumulative total at the end of the week.
  • 累計 is the total obtained by adding quantities recorded over time.