Collected or gathered together in large quantities over time.
From Old French 'amasser,' combining 'a-' (to) and 'masse' (mass or lump). The meaning evolved from literally piling up physical objects to accumulating anything valuable.
Billionaires amass fortunes, scientists amass data, and squirrels amass nuts—the word works for any creature collecting something valuable, which is why it's been around since medieval times.
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