Webster's English Dictionary

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response

re.sponse \ri-'spa:n(t)s\ n [ME & L; ME respounse, fr. MF respons, fr. L 
   responsum reply,] fr. neut. of responsus, pp. of responde-re 1: an act of 
   responding  2: something constituting a reply or a reaction : as  2a: the 
   activity or inhibition of previous activity of an organism or any o f its 
   parts resulting from stimulation 2b: the output of a transducer or 
   detecting device resulting from a given i nput