IPA: /əˈkriːʃən/
KK: /əˈkriːʃən/
A process where something gradually increases in size or mass by collecting additional material or parts over time.
The accretion of sediment along the riverbank has created new land over the years.
Accretion is formed from "ad-" (meaning to) and "crescere" (meaning to grow). The word describes the process of growth or increase by gradual accumulation.
Think of something 'growing' ('crescere') as it 'adds to' ('ad-') itself over time — that's what accretion means.