accretion

1 ENTRIES FOUND:
accretion /əˈkriːʃən/ noun
plural accretions
accretion
/əˈkriːʃən/
noun
plural accretions
Britannica Dictionary definition of ACCRETION
1 
[noncount] : a gradual process in which layers of a material are formed as small amounts are added over time — often used figuratively
2 
[count] : something that has grown or accumulated slowly : a product or result of gradual growth