The Merriam-Webster Online Dictionary defines plagiarism as:
Plagiarism is using any work that is not authored by you without giving proper credit. Plagiarism is also claiming that another person's ideas, or the expression of the ideas (literary, artistic, musical, mechanical, etc.) are your own. You must always cite any information obtained from any source.
A citation is a record of where you encountered a certain idea. Citing your sources helps other scholars track down resources they find of interest. Proper citation helps us all build on our knowledge.
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