What is the meaning of summation?

noun

• A concluding summary (as in presenting a case before a law court.
  • synonyms: summing up, rundown
• 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. (
• The final aggregate.
  • usage: "the sum of all our troubles did not equal the misery they suffered"
  • synonyms: sum, sum total
• The arithmetic operation of summing; calculating the sum of two or more numbers.
  • usage: "the summation of four and three gives seven"; "four plus three equals seven"
  • synonyms: addition, plus