A person who drives or operates an automobile, especially one who is skilled or professional in doing so.
From auto- (self) + car + -ist (one who practices or specializes in). Emerged in early 20th century when automobiles became common and required specialized operators.
This word is nearly extinct now—we just say 'driver'—but it shows how new technologies create new job titles that eventually fade as the technology becomes so ordinary that the specialized term disappears.
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