the practice of stealing someone else's work or ideas and passing them off as one's own without giving credit to the source, i.e. the practice of plagiarizing;
e.g. There is evidence of plagiarism in this article, since it is very similar to an earlier article.
(noun)
the action of presenting someone else's ideas, words, or product as original;
e.g. The author was accused of plagiarism in his latest book since it borrowed heavily from an earlier book.