[suh-mey-shuh
n] 
| 1. | the act or process of summing. |
| 2. | the result of this; an aggregate or total. |
| 3. | a review or recapitulation of previously stated facts or statements, often with a final conclusion or conclusions drawn from them. |
| 4. | Law. the final arguments of opposing attorneys before a case goes to the jury. |
| 5. | Physiology. the arousal of impulses by a rapid succession of stimuli, carried either by separate sensory neurons (spatial summation) or by the same sensory neuron (temporal summation). |
summation sum·ma·tion (sə-mā'shən)
n.
The process by which multiple or repeated stimuli can produce a response in a nerve, muscle, or other part that one stimulus alone cannot produce.