Practitioner
来自Big Physics
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mid 16th century: extension of obsolete practitian, variant of practician.
wiktionary
Formerly practicioner for *practicianer, from practician + -er (the suffix unnecessarily added, as in musicianer).
etymonline
practitioner (n.)
1540s, "one who acquires knowledge from actual practice;" a hybrid formed from practitian "practitioner" (c. 1500; see practician), with redundant ending on model of parishioner. Meaning "one engaged in the actual practice of an art or profession" is from 1550s. Johnson has as a secondary sense "One who uses any sly or dangerous arts" (compare practice (n.)). A general practitioner originally was "someone who practices both medicine and surgery."
