"teaching," 1630s, from Latin docentem (nominative docens), present participle of docere "to show, teach, cause to know," originally "make to appear right," causative of decere "be seemly, fitting," from PIE root *dek- "to take, accept."
As a noun, "lecturer or teacher (usually a post-graduate student) in a college, not on staff but permitted to teach," by 1880, from German.
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