Webster's English Dictionary

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cation

cat.ion \'kat-.i--*n\ n [Gk kation, neut. of katio-n, prp. of katienai to 
   go down,] fr. kata- cata- + ienai to go - more at ISSUE : the ion in an 
   electrolyzed solution that migrates to the cathode; bro adly : a positively 
   charged ion