The word "accumulation" means a building up or piling up of things. We "accumulate" belongings over our lifetimes. Snow can "accumulate" on the ground in the winter.
Accumulation is also a rhetorical device. When a writer or speaker "gathers up" different points, or different ways of saying the same thing. This can be done to connect different aspects of a topic, or it can be done simply to summarize a collection of points that the speaker or writer wants to make. It helps to emphasize points by listing them together and can be an effective way to conclude.
Examples of Accumulation from Speech and Literature
1. Shakespeare "accumulates" names for the king in Henry V: "Then shall our names, familiar in his mouth has household words, Harry the King, Bedford and Exeter, Warwick and Talbot, Salisbury and Gloucester, be in their flowing cups freshly remembered."
2. In the Bible, this verse "accumulates" physical things that occur, yet the Earth remains: "A generation goes and a generation comes, yet the earth remains forever. The sun rises and the sun sets, and rushes back again to the place from which it rises. The wind blows south, then returns to the north, round and round goes the wind, on its rounds it circulates. All streams flow to the sea, yet the sea does not fill up."
3. "Your organization, your vigilance, your devotion to duty, your zeal for the cause must be raised to the highest intensity." Winston Churchill
4. "I don't know how to manage my time; he does....
I don't know how to dance and he does.
I don't know how to type and he does." Natalia Ginzburg