1. One actually engaged in any art or profession, specially medicine or law.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• practidoner,
• practioner,
• practicioner,
• practitionner,
• practition,
• practiciner,
• practitionar,
• practtioner,
• pratitioner,
• practitionners,
• practiotioner,
• practitions,
• practinioners,
• practintioners,
• practtitioner,
• practicianer,
• practitoners,
• practiitoner,
• pracitioner,
• practicioners

• proctitis,
• precaution,
• proactive,
• practicable,
• practician,
• precautionary,
• prostitution,
• precautional,
• practicing,
• practicality.

The adjective form of the word "practitioner" is "practitioner". The word itself can function as both a noun and an adjective, describing someone who practices a specific profession or skill.

The plural of the "practitioner" can be the "practitioners".

The singular of the "practitioner" can be the "practitioner".