n 1  :  energy radiated in the form of waves or particles  2 a  :  the action or process of radiating <with of the pain there may be tenderness over the sciatic nerve -J. A. Key>   b (1) :  the process of emitting radiant energy in the form of waves or particles (2) :  the combined processes of emission, transmission, and absorption of radiant energy  3  :  a tract of nerve fibers within the brain : esp  :  one concerned with the distribution of impulses arising from sensory stimuli to the relevant coordinating centers and nuclei <the optic s>  .
 
 
 
Similar sounding terms:  ro·ta·tion 
 
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