sum¹/sʌm; sʌm/ n [C] 1 an amount of money 金额: The city has spent a large sum of money on parks. 该市花了一大笔钱在公园上。 2BrE a simple CALCULATION such as adding or dividing numbers 【英】 简单的计算，算术 3 the sum of the total when you add two or more numbers together 和，总和，总数: The sum of 4 and 5 is 9. 4 加 5 等于 9。