Glossary

Plagiarism is defined by the act, not by whether anyone catches it

Plagiarism is presenting someone else’s words, ideas, structure, data, or images as your own — by omitting attribution, by attributing so loosely that the borrowing is hidden, or by reproducing phrasing while implying it is yours. The act defines it, not the outcome: unattributed text is plagiarism whether or not anyone ever notices.

Why it matters when you are writing

It takes several forms, and only the crudest involves copying a whole paper. Reproducing a sentence without quotation marks is plagiarism even with a citation attached, because the citation signals an idea while the missing marks conceal that the words are borrowed. Taking a source’s argumentative structure and rewriting each step in your own words is plagiarism of organization. Using a figure, dataset, or block of code without credit is plagiarism too, and it carries a copyright question on top.

Institutions differ on how much intent matters to the penalty, but almost none treat it as a defense to the finding itself. A citation you meant to add and never did produces the same page as a citation you deliberately omitted. That is why the practical protection is procedural rather than moral: mark every quotation the moment you paste it, record the source with the note, and never leave “add cite” for the final pass.

The honest complication is that scholarship is cumulative — you are supposed to build on other people’s work. The rule is not originality of thought at every sentence, it is transparency about where each element came from. If a reader can tell which words are yours, which ideas you inherited, and where to go to check, you have met the standard.

IN PRACTICE

Where the line falls

Source: “Policy texts hedge most heavily where enforcement is weakest.” Plagiarism, even with a citation: Policy texts hedge most heavily where enforcement is weakest (Hardin, 2019). Acceptable: Hardin (2019) found that hedging clusters in exactly those provisions that are hardest to enforce.

OFTEN CONFUSED WITH

What Plagiarism is not

Self-plagiarism: Plagiarism takes credit for someone else’s work; self-plagiarism takes credit twice for your own without disclosing the reuse.
Copyright infringement: Plagiarism is an ethical failure of attribution and can occur with public-domain material; infringement is a legal matter and can occur even when you credit the author.
Similarity score: A similarity score reports matched text, including properly quoted and cited passages; plagiarism is a judgment about attribution that a human has to make.

Questions about plagiarism

Is accidental plagiarism still plagiarism?

Most institutional policies say yes, while treating intent as relevant to the penalty rather than to the finding. Sloppy note-taking is the usual cause, and it is fixable with process.

Does citing a source make copying its words acceptable?

No. A citation credits the idea; quotation marks signal that the wording is borrowed. Reproducing phrasing without marks is plagiarism even when the citation is present.

Can you plagiarize an idea you arrived at independently?

You are expected to know the literature you are writing into. Independent arrival is a genuine explanation, but the response is to find the prior work and cite it, not to publish as though it did not exist.

How much text has to match before it counts?

There is no threshold. A single distinctive phrase presented as yours can qualify, and a long passage that is quoted, marked, and cited does not.

Related terms

Self-plagiarism

Self-plagiarism means reusing your own previously submitted or published work as if it were new, without disclosing the earlier version.

Patchwriting

Patchwriting sits halfway between quoting and paraphrasing: you keep the source’s sentence skeleton and swap in synonyms, so the phrasing belongs to neither the author nor to you.

Academic integrity

Academic integrity covers the commitments that make scholarly claims trustworthy: reporting honestly what you did, crediting whoever got there first, and being transparent about the help you had — from a colleague, an editor, or a tool.

Paraphrasing

Paraphrasing restates a source’s point in your own sentence structure and vocabulary, at roughly the same length, with the citation kept.

Turnitin similarity score

Turnitin reports a similarity score: the percentage of a submission that matches text in its comparison databases.

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