A more thorough explanation:

Definition: ex integro (eks in-tə-groh) means to start over or begin anew. Example 1: After failing the exam, she decided to study ex integro and retake it next semester. Example 2: The company had to rebuild ex integro after a devastating fire destroyed their entire office. These examples illustrate the definition of ex integro by showing situations where something needs to be started over or done again from the beginning. In the first example, the student failed the exam and needs to start studying again from scratch. In the second example, the company's office was destroyed, so they need to rebuild everything from the ground up.