IPA: /əˈmæs.mənt/
KK: /əˈmæs.mənt/
The process of gathering or collecting a large amount of something, often over time.
The amassment of wealth can lead to significant power in society.
Amassment is formed from "amass" (from Old French *amasser*, meaning to gather together) and "-ment" (a suffix used to form nouns indicating an action or resulting state). The word refers to the act or state of gathering or accumulating things together.
Think of gathering things together ('amass') and the '-ment' indicating the state of that action. This helps you remember that 'amassment' means the act of accumulating.