1. the process of gathering or collecting something over time
2. a mass or quantity that has been collected or gathered

Examples

• The accumulation of snow on the roof caused structural damage.
• Years of dust accumulation made the attic nearly uninhabitable.
• His accumulation of wealth took decades of careful investing.
• The accumulation of evidence finally led to a conviction.
• There was a large accumulation of leaves in the yard after the storm.
• The gradual accumulation of knowledge requires consistent study.
• Ice accumulation on the roads made driving dangerous.