Definify.com
Webster 1913 Edition
Practitioner
1.
One who is engaged in the actual use or exercise of any art or profession, particularly that of law or medicine.
Crabbe.
2.
One who does anything customarily or habitually.
Webster 1828 Edition
Practitioner
PRACTI'TIONER
,Noun.
1.
One who does any thing customarily or habitually.2.
One that practices sly or dangerous arts.