See under summation(def 5).
Why Do “Left” And “Right” Mean Liberal And Conservative?During election seasons the words left and right denote political affiliation more than spatial direction. But where do these associations come from? The left hand has long been associated with deviance. The word “sinister” originally meant “to the left” in Latin. The word “left” comes from the Old English word lyft, which literally meant “weak, foolish.” To avoid the negative and superstitious associations of the …
What Are Transition Words?Good transitions connect one sentence or paragraph to the next. A word, phrase, or sentence can serve as a transition to help make a shift in relationship, space, or time. Transitions connect ideas and supporting examples. They signal the coming of additional information or a conclusion. Transitions in Relationship Some transition words and phrases are used to compare and contrast. These include comparable to, in …
Origin of spatial summation
First recorded in 1965–70
Definition for spatial summation (2 of 2)
[ suh-mey-shuh n ]
/ səˈmeɪ ʃən /
the act or process of summing.
the result of this; an aggregate or total.
a review or recapitulation of previously stated facts or statements, often with a final conclusion or conclusions drawn from them.
Law. the final arguments of opposing attorneys before a case goes to the jury.
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).
Origin of summation
Related formssum·ma·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for spatial summation
/ (sʌˈmeɪʃən) /
the act or process of determining a sum; addition
the result of such an act or process
US law the concluding statements made by opposing counsel in a case before a court
Derived Formssummational, adjectivesummative, adjective
Word Origin for summation
C18: from Medieval Latin summātiō, from summāre to total, from Latin summa sum 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for spatial summation
1760, from Modern Latin summationem (nominative summatio) "an adding up," from Late Latin summatus, past participle of summare "to sum up," from Latin summa (see sum).
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for spatial summation
[ sə-mā′shən ]
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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.