A more thorough explanation:

Definition: Irregularity refers to something that is not regular or normal. It can be an action or practice that deviates from the usual way of doing things. In Ecclesiastical law, it can also refer to an obstacle that prevents someone from holding a clerical office.

• Skipping class is an irregularity that can affect your grades.
• Using a different method to solve a math problem is an irregularity.
• In the Catholic Church, a priest who has been excommunicated cannot hold a clerical office due to an irregularity.

The examples illustrate how irregularity can refer to something that is not in line with the usual or expected way of doing things. Skipping class or using a different method to solve a problem are irregularities because they deviate from the normal conduct of a student. In Ecclesiastical law, an irregularity can prevent someone from holding a clerical office because it is an obstacle that goes against the requirements for the position.