Plagiarism is defined as:
"The action or practice of taking someone else's work, idea, etc., and passing it off as one's own; literary theft"
(OED Online 2006). [OED Online [Internet]. plagiarism, n. Oxford University Press. 2006. [cited 2007 Jul 30]. Available from: http://www.oed.com/view/Entry/144939?redirectedFrom=plagiarism#eid
Avoiding Plagiarism - from the OWL at Purdue. This resource offers advice on how to avoid plagiarism in your work.
UH Manoa Student Conduct Code
See section H - Academic Dishonesty - in particular.