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spatial vs. temporal summation

[ spey-shuhl ]
adjective
  1. of or relating to space, the three-dimensional realm or expanse in which all material objects are located and all events occur.
  2. existing or occurring in space; having extension in space.
[ tem-per-uhl suh-mey-shuhn, tem-pruhl ]
noun
  1. See under summation (def. 5).