practitioner
n.-
1 professional worker (n.) C1 Advanced Formal Academica person who works in a job that needs special skills and training, especially in medicine or law.
an individual who actively exercises a profession, particularly in the medical or legal fields. Often used to distinguish those in active practice from those in research or academia.
ExampleYou should consult a medical practitioner if the pain in your back continues.
ExampleThe conference brought together both academic researchers and legal practitioners to discuss the practical implications of the new legislation.
UsageOften preceded by a qualifying adjective like 'medical', 'legal', or 'general'.
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2 someone who follows a belief (n.) C1 Advanced Formalsomeone who regularly does a specific activity or follows a particular religion or method.
one who habitually performs a specific activity or adheres to the rites and practices of a religion or philosophy.
ExampleShe has been a dedicated practitioner of yoga for over ten years.
ExampleAs a lifelong practitioner of non-violence, the leader refused to support any form of military intervention.
UsageUsually followed by the preposition 'of'.
Formerly practicioner for *practicianer, from practician + -er (the suffix unnecessarily added, as in musicianer).