"In simple terms, “Plagiarism” refers to using someone else's ideas and presenting them as your own, whether done knowingly or unknowingly.
A more formal definition is: 'the act of taking the writings of another person and passing them off as one's own.'
Source: Plagiarism. (2016). In Encyclopedia Britannica. Retrieved from "http://academic.eb.com/levels/collegiate/article/60277"