malpractice Syllabification: (mal·prac·tice)Pronunciation: /malˈpraktəs/Translate malpractice | into French | into German | into Italian | into Spanish Definition of malpractice noun improper, illegal, or negligent professional activity or treatment, especially by a medical practitioner, lawyer, or public official:victims of medical malpractice investigations into malpractices and abuses of powermalpractice in other Oxford dictionaries Definition of malpractice in the British & World English dictionary