Webster's English Dictionary

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controller

con.trol.ler \k*n-'tro--l*r, 'ka:n-.\ \-.ship\ n [ME conterroller, fr. MF 
   contrerolleur, fr. contrerolle] 1a: COMPTROLLER  1b: COMPTROLLER  1c: the 
   chief accounting officer of a business enterprise or an institution  (as a 
   college) 2: one that controls or has power or authority to control  - 
   con.trol.ler.ship n