Wiktionary
accumulatio
n. (context rhetoric English) A forceful summarisation of previously made points
Wikipedia
Accumulatio
Accumulatio is a figure of speech, part of the broader group of enumeratio, in which the points made previously are presented again in a compact, forceful manner. It often employs the use of climax in the summation of a speech.
The word is Latin, from a verb meaning "to amass."