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practitioner

/pɹækˈtɪʃənə/ noun

In Latin: exercitator, exercitatrix Wiktionary

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about practitioner at Wordnik → Where our words come from →

  1. Someone who practices a learned profession.

Origin

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

From Wiktionary, via Kaikki.org (CC BY-SA)