According to the Merriam Webster Online Dictionary, to plagiarize is:
1. to steal and pass off (the ideas or words of another) as one's own; use (another's production) without crediting the source
2. to commit literary theft; present as new and original an idea or product derived from an existing source
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There are four basic types of plagiarism:
*Material found at Bowden University The Common Types of Plagiarism and WriteCheck Self-Plagiarism.