practitioner

Etymology

Formerly practicioner for *practicianer, from practician + -er (the suffix unnecessarily added, as in musicianer).

noun

  1. A person who practices a profession or art, especially law or medicine.
    The [Isaac] Newton that emerges from the [unpublished] manuscripts is far from the popular image of a rational practitioner of cold and pure reason. The architect of modern science was himself not very modern. He was obsessed with alchemy. 2014-06-21, “Magician’s brain”, in The Economist, volume 411, number 8892
  2. One who does anything customarily or habitually.
  3. (dated) A sly or artful person.
    […] the men of St. John's were cunning practitioners, in shaking off their Masters and Heads. c. 1572, John Whitgift, Admonition to the Parliament

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