Webster's New Collegiate Dictionary.
Plagiarism is dishonorable.
It involves using the words, information, insights, or ideas of another without crediting that person through proper citation. Since authorship is ownership, using the intellectual property of others without credit is theft. Passing off another person's work as your own is lying. You can avoid plagiarism by fully and openly crediting all sources used. If you decide to use someone else's words in any form, you must use quotations in order to show that you are borrowing the same.