Accrual (noun)

1. The growth or increase of something.
2. The accumulation of something, especially over time.

Origin:

Late middle english: from old french accroissement, from accroître 'increase', from latin accrescere.

Examples:

1. The accrual of wealth through investment.
2. The accrual of leaves on the forest floor.
3. The accrual of power to the monarchy over the centuries.
4. Accrual of bonuses was based on the company's profits.
5. The accrual of knowledge through reading and study.