accretion

1. N-COUNT An accretion is an addition to something, usually one that has been added over a period of time. 累加物[正式]

The script has been gathering editorial accretions for years. 该剧本经历了多年的修改加工。

2. N-UNCOUNT Accretion is the process of new layers or parts being added to something so that it increases in size. 累积[正式]

A coral reef is built by the accretion of tiny, identical organisms. 珊瑚礁是由相同的微生物累积形成的。