Open English Wordnet
Nouns
(n)summation(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 (n)sum, summation, sum totalthe final aggregate“the sum of all our troubles did not equal the misery they suffered” (n)summation, additionthe arithmetic operation of summing; calculating the sum of two or more numbers“the summation of four and three gives seven”