Question

What actually counts as plagiarism?

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Answer

Plagiarism is presenting someone else's work, ideas or words as your own. The definition is broader than most students assume, and intention is often not the deciding factor.

What counts:

Copying text without quotation marks and a citation. Even a single sentence. Citing without quoting is still plagiarism if the words are verbatim.

Paraphrasing too closely. Changing a few words while keeping the sentence structure and order of ideas is patchwriting, and it is treated as plagiarism at most institutions even with a citation attached. Genuine paraphrase requires understanding the idea and expressing it independently.

Using someone's ideas, argument or structure without credit, even in entirely your own words. Ideas require citation, not just phrasing.

Self-plagiarism — resubmitting your own previous work for a second assessment without permission. Counterintuitive but standard policy.

Uncredited data, figures, images, code and translations. Translating a foreign-language source without citation is plagiarism.

Collusion — working together on something meant to be individual.

Contract cheating — buying or commissioning work. This is the most serious form, and it is a criminal offence to provide such services in some jurisdictions, including England.

What does not count: common knowledge (facts widely known and available in many sources, though the boundary is discipline-specific), your own genuinely independent ideas, and properly quoted and cited material of any length within reason.

On AI tools: policies vary enormously and are changing quickly. Some institutions prohibit generative AI outright, some permit it with declaration, some allow it for specific tasks. Check the policy for your specific course, and do not assume that undetectable means permitted.

Intent is usually irrelevant to whether it happened, though it often affects the penalty. "I forgot to cite" is not a defence.

Keep notes that distinguish quotation from paraphrase as you research — most accidental plagiarism starts there.

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