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Oxford dictionary definition of the word sum:

noun

the result of the addition of numbers, quantities, objects, etc

the cardinality of the union of disjoint sets whose cardinalities are the given numbers

one or more columns or rows of numbers to be added, subtracted, multiplied, or divided

(mathematics) the limit of a series of sums of the first n terms of a converging infinite series as n tends to infinity

(plural) another name for number work

a quantity, esp of money ⇒ he borrows enormous sums

the essence or gist of a matter (esp in the phrases in sum, in sum and substance)

a less common word for summary

(archaic) the summit or maximum

(modifier) complete or final (esp in the phrase sum total)

verb

Word forms: sums, summing, summed

(often followed by up) to add or form a total of (something)

(transitive) to calculate the sum of (the terms in a sequence)