According to CMC's Statement of Academic Integrity:
Plagiarism means the use of the thoughts, ideas, words, phrases, or research of another person or source without explicit and accurate attribution. In keeping with this definition, all work, whether written or oral, submitted or presented by students at the College as part of course assignments or for College sponsored activities, must be the original work of the student unless otherwise specified by the instructor. Students must insure that elements of language and argument included in their work are properly acknowledged whenever those elements appear in other sources, including the student’s own previously submitted work.
For a more detailed explanation of plagiarism, check the Statement of Academic Integrity.
Academic Integrity Tutorial