At UE it is plagiarism when you:

• Use four or more significant words or ideas of another person without citing them
• Summarize or paraphrase words or ideas of another person without citing them
• Borrow facts, statistics, or other material, unless the information is common knowledge
• Buy or use a term paper written by someone else
• Cut and paste passages from the Web, a book, or an article and insert them into your paper without citing them

As you can see,plagiarism ranges from copying word-for-word to paraphrasing a passage without credit and changing only a few words.