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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Countershaft  \Coun"ter*shaft`\  (koun"t?r-sh?ft`),  n.  (Mach.) 
  An  intermediate  shaft;  esp.,  one  which  receives  motion  from  a 
  line  shaft  in  a  factory  and  transmits  it  to  a  machine.