This second edition of Legal and Ethical Dictionary for Mental Health Professionals confronts the problems arising from a lack of clear understanding of mental health laws or terminologies. Case law continues to show that mental health professionals (MHPS) lose cases because they base their professional actions on incorrect definitions or misunderstandings of legal and ethical terms. Some have been professionally sanctioned or had their licenses revoked as a result of making professional decisions or actions based upon improper understanding of confusing language. This dictionary provides MHPS with clear and concise definitions of legal and ethical terminologies. To enhance the professional's understanding, a professional significance section has been added after the definitions to further comprehension of practical dimensions of the words and to aid in legal and ethical decision-making.