The process of accumulating, gathering together, or piling up; the act of becoming cumulative.
From Latin 'cumulare' (to heap, pile up) plus -tion suffix. Related to 'cumulus' (heap of cloud) and 'accumulate'. A formal term for the process of gathering.
Clouds named 'cumulus' literally means 'heaped'—and 'cumulation' uses the same root, reminding us that meteorology and common speech both borrowed Latin's language for piling things together.
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