accretion
noun [ C or U ] formal uk/əˈkriː.ʃən/ us/əˈkriː.ʃən/
堆积，积聚；逐渐的增加，增大
a gradual increase or growth by the addition of new layers or parts
The fund was increased by the accretion of new shareholders. 由于新股东的逐渐加入，资金增加了。
The room hadn't been cleaned for years and showed several accretions of dirt and dust. 房间多年没有打扫，积了厚厚的灰尘。