Self-plagiarism
Also called: text recycling, duplicate publication
Reusing your own previously submitted or published work as though it were new, without disclosing it.
Submitting the same essay to two courses, or republishing a paper's substance without saying so, misrepresents how much new work exists. In publishing it also risks breaching the copyright you assigned to the first journal, and it double-counts findings in any later meta-analysis.
Reusing your own material is often legitimate — methods sections in particular are frequently and reasonably recycled. The rule is disclosure: cite your earlier work, and ask the editor or instructor where you are unsure.
See also
PlagiarismPresenting someone else's words, ideas, data, or structure as your own, whether deliberately or through careless citation.AttributionNaming the source of a specific idea, phrase, method, or dataset so a reader knows what is yours and what is borrowed.CopyrightThe legal right controlling copying and reuse of a creative work, which is separate from the academic duty to cite.