Webster's English Dictionary

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deputy

dep.u.ty \'dep-y*t-e-\ n [ME, fr. MF depute` pp. of deputer] often attrib  
   1a: a person appointed as a substitute with power to act  1b: a 
   second-in-command or assistant who usu. takes charge when his superio r is 
   absent 2: a member of the lower house of some legislative assemblies