malpracticePronunciation: /malˈpraktɪs/Translate malpractice | into French | into German | into Italian | into Spanish Definition of malpractice noun [mass noun] improper, illegal, or negligent professional behaviour:victims of medical malpractice [count noun]:investigations into malpractices and abuses of powermalpractice in other Oxford dictionaries Definition of malpractice in the US English dictionary