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practitioner

[prak-tish-uh-ner]
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noun
  1. a person engaged in the practice of a profession, occupation, etc.: a medical practitioner.
  2. a person who practices something specified.
  3. Christian Science. a person authorized to practice healing.
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Origin of practitioner

1535–45; alteration of practician (practic + -ian) + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for practitioner

practitioner

noun
  1. a person who practises a profession or art
  2. Christian Science a person authorized to practise spiritual healing
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Word Origin

C16: from practician, from Old French praticien, from pratiquer to practise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for practitioner

n.

1540s, a hybrid formed from practitian "practitioner" (c.1500, from French practicien, from Late Latin practicus "fit for action," see practice (v.)) on model of parishioner. Johnson has as a secondary sense "One who uses any sly or dangerous arts."

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Online Etymology Dictionary, © 2010 Douglas Harper

practitioner in Medicine

practitioner

(prăk-tĭshə-nər)
n.
  1. One who practices medicine or an allied health profession.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.