1. the process of accumulating or gathering together; the act of combining or adding up over time
2. something that has been accumulated; a collection or mass formed by gathering things together

Examples

• The cumulation of small daily efforts led to significant progress over the year.
• Years of cumulation had filled the attic with boxes of old belongings.
• The cumulation of evidence convinced the jury of the defendant's guilt.
• Wealth often results from the cumulation of wise financial decisions.
• The cumulation of dust on the shelves showed how long the room had been neglected.
• Scientists studied the cumulation of greenhouse gases in the atmosphere.