1. the size of a plane or solid
E.g.: 面積 (area), 容積 (capacity, volume)
2. product (the result of multiplying two or more numbers or expressions)
3. to pile up; to accumulate; to stack
E.g.: 積載 (cargo loading), 積善 (accumulation of good deeds)
4. accumulation; to store; to amass
E.g.: 蓄積 (accumulation)
