According to the Merriam-Webster Online Dictionary, to "plagiarize" means:
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!
You are guilty of plagiarism if you...
There are serious consequences that you may face if you are found to have commited the act of plagiarism. See the Academic Integrity Policy for more information.
If you still need help, see your instructor for more information!