Sum/sʌm/ Definition 1 of 5Pro Tip 1/3Mathematical Result Refer to a final number from addition, without detailing the numbers involved. After reviewing the bill, the sum was more than expected. Pro Tip 2/3Total Amount Emphasize the collective value or amount, often relating to money or quantities. The charity raised a sum that surpassed their goals. Pro Tip 3/3Phrase Linkage Use 'sum' with phrases like 'sum total' to stress the completeness of a number. The sum total of damages was calculated by the insurer.