Mathematicsthe total of two or more numbers, amounts, or quantities, determined by or as if by addition:The sum of 6 and 8 is 14.
an amount or quantity, esp. of money:to lend small sums.
Mathematicsa series of numbers or quantities to be added up.
the full amount, or the whole:the sum of our knowledge.
the main idea, gist, or point:the sum and substance of his argument.
Mathematics[~ + object] to figure out the sum of, as by addition.
to express in a brief yet complete statement; summarize: [~ + up + object]He summed up the main points of the speech.[~ + object + up]Can you sum it all up in just a few words?[no object]ready to sum up at last after a long speech.
to form a quick estimate or judgment of: [~ + up + object]quickly summed up the situation.[~ + object + up]She summed him up in a minute.
Idiomsin sum, in brief but complete form:In sum, the government believes it knows what it is doing.
-sum- comes from Latin, where it has the meaning "take up; pick up.'' This meaning is found in such words as: assume, consume, consumption, presume, presumption, resume, resumé, resumption, subsume.