An archaic or rare form meaning to accumulate or pile up; an obsolete term rarely used in modern English.
From Latin 'accumulare' (to heap up), with 'ad-' (to) + 'cumulus' (heap). An early English form that was superseded by the more complete 'accumulate.'
This word is almost extinct from English—it's a linguistic fossil showing how older, simpler forms get replaced by more detailed ones, like how 'accum' gave way to the fuller 'accumulate.'
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