Added numbers or amounts together to get a total; concluded or summarized something briefly.
From 'sum' (total), which comes from Latin 'summa' (the highest point, total amount). The verb 'to sum' has meant 'add together' since medieval times, with '-ed' forming the past tense.
Latin 'summa' literally meant 'the highest point'—because when you add numbers, the total is at the top of your calculation. That's why 'summa cum laude' means 'with the highest honor.' Math words carry their metaphors!
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