IELTS sum Definition The total amount resulting from the addition of numbers. Example "The sum of 7 and 8 is 15." Sign in to save IELTS Quiz → ← sultry summary → Study tips featuring "sum" Study the Exact Words Examiners Use Audit Your Own Writing for Lexical Resource Explain New Words Out Loud To Yourself Related words TOEFL brighten IELTS startle GRE abide SAT abnormal TOEFL aboard TOEFL abolition IELTS upward TOEFL abort IELTS abortion SAT abrupt SAT absence TOEFL absent