A more thorough explanation:

Definition: To presume something is true or to offer it as true. It can also mean to present something as an explanation.

1. The scientist posited that the new drug would cure the disease.

2. The detective posited that the suspect was at the scene of the crime based on the evidence.

3. The teacher posited that the reason for the student's poor grades was due to a lack of studying.

These examples illustrate how someone can posit something as true or offer it as an explanation. In the first example, the scientist is presenting the idea that the new drug will cure the disease. In the second example, the detective is presuming that the suspect was at the scene of the crime based on the evidence. In the third example, the teacher is presenting the idea that the student's poor grades are due to a lack of studying.