Webster's English Dictionary

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practitioner

prac.ti.tion.er \prak-'tish-(*-)n*r\ n [alter. of earlier practician, fr. 
   ME (Sc) pratician, fr. MF pra]ticien, fr. pratique 1: one who practices; 
   esp : one who practices a profession  2: Christian Science : an authorized 
   healer