The act of heaping together; accumulation or piling up of things in one mass.
From Latin 'commulare,' composed of 'com-' (together) and 'mula' (heap), plus the suffix '-tion' indicating an action or process. Related to the word 'cumulate' meaning to heap or gather.
This word is almost extinct in English, but 'commulation' reveals how Latin speakers thought about gathering things—as heaps piled together—which is why we still use 'accumulate' (to heap toward) in modern times.
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