summation

Summation has 3 syllables: sum · ma · tion.

noun. The final aggregate.

noun. The arithmetic operation of summing; calculating the sum of two or more numbers.

noun. A concluding summary (as in presenting a case before a law court).

noun. (physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce.