Legal Definition of Injury: Harm done to a person’s physical or mental well-being; harm to one’s pride or reputation; harm to one’s rights and privileges. Often the harm has resulted from the violation of one’s legal rights by another | Learn the legal definition of injury and how it applies to personal injury law. Discover the different types of harm that can be classified as injury, including physical, mental, and reputational. Understand the importance of protecting the rights and well-being of individuals within your business. Take proactive measures to prevent harm and safeguard your business’s success