The Administrative Regulations defines plagiarism, cheating, and the misuse of academic records. The definitions are available here.
The "silent majority" of students rely upon the faculty to uphold academic integrity and to ensure that the basic principles of fairness and honesty prevail throughout the examination experience. It is the honest students who are cheated if we do not fulfill our responsibility to prevent cheating and plagiarism. One way to decrease cheating may be to explain to students the value you, your department, your college, and the university community place on academic integrity and explain why cheating is fundamentally unfair.