Many people think of plagiarism as copying another's work or borrowing someone else's original ideas. But terms like "copying" and "borrowing" can disguise the seriousness of the offense:
In other words, plagiarism is an act of fraud. It involves both stealing someone else's work and lying about it afterward.
The BTC Library has a guide to plagiarism. Follow the embedded link, or see http://btc.ctc.libguides.com/Plagiarism