Explainer · Plain-language

What Is Plagiarism? Definition, Types & Consequences | CASRAI

Plagiarism is presenting another person's words, ideas, or work as your own without proper attribution. In academic and research contexts it is treated as a serious breach of integrity, with consequences ranging from failing a course to retraction of published work and career damage.

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Types of plagiarism

Direct or verbatim plagiarism copies text word for word without quotation marks or citation. Paraphrasing plagiarism rewrites another's ideas in different words without acknowledging the source. Self-plagiarism — sometimes called text recycling — occurs when an author reuses substantial portions of their own previously published work without disclosure, which can mislead readers about the novelty of the contribution. Patchwork or mosaic plagiarism stitches together phrases from multiple sources with light paraphrasing. Ghost-writing, when the named author did not write the work, is a distinct form of academic dishonesty. AI-generated text that is submitted as original work is an emerging category that many institutional policies now explicitly address.

Consequences in academic and research contexts

In education, plagiarism can result in a failing grade, suspension, or expulsion. In research, consequences are more severe: a published paper may be formally retracted (creating a permanent public record in databases such as Retraction Watch), a researcher's credibility and future funding opportunities may be damaged, and in cases involving grant applications, institutions may be required to return funds. Professional bodies, including COPE (Committee on Publication Ethics), maintain guidelines for editors and publishers on how to investigate and respond to suspected plagiarism in submitted and published manuscripts.

Detection software and its limits

Software such as Turnitin and iThenticate compares submitted text against databases of published works, websites, and previously submitted work, producing a similarity score. A high similarity score flags potential issues but does not itself prove plagiarism — properly quoted and cited text will show similarity. Academic integrity panels consider context: whether text is quoted correctly, whether ideas are attributed, and whether the overall submission demonstrates the student's or author's own understanding. Detection tools are one input into a human judgment process, not an automated verdict.

Distinction from copyright infringement

Plagiarism and copyright infringement are related but distinct. Copyright infringement is a legal concept: reproducing a copyrighted work beyond fair dealing or fair use without a licence, regardless of attribution. Plagiarism is an ethical concept: failing to give credit, regardless of copyright status. Public domain text can be plagiarised; text can also be properly attributed yet still infringe copyright if reproduced excessively without permission. Both can occur together, but they require different responses — institutional integrity procedures for plagiarism, and legal remedies for copyright infringement.

Key facts

At a glance

Definition: Presenting another's words, ideas, or work as your own without attribution
Key types: Direct copying, paraphrasing, self-plagiarism, patchwork, ghost-writing
Detection: Turnitin and iThenticate compare text against published and submitted work
Consequences: Failing grade, retraction, career damage, funding recovery
COPE: Provides editors with guidelines for investigating suspected plagiarism
Vs copyright: Plagiarism is ethical; copyright infringement is legal — both can coexist

Common misconceptions

What people often get wrong

Often heard: Paraphrasing someone's idea in your own words means you don't need a citation.

Actually: No — if the idea, argument, or finding originated with another author, it must be cited even when expressed in different words. Only common knowledge is exempt from citation.

Often heard: Self-plagiarism is not real plagiarism because the text is your own.

Actually: Reusing substantial portions of your own published work without disclosure — text recycling — is a recognised research integrity concern because it misrepresents prior publication as new contribution and can inflate citation counts.

Often heard: A similarity score below a threshold means there is no plagiarism.

Actually: No — software similarity scores are a screening aid, not a verdict. Low overlap can still conceal idea theft; high overlap can include legitimately quoted text. Institutional panels examine context and intent.

Going deeper