1. The condition of something that is uneven or asymmetrical; roughness: When the cabinet maker checked his assistent's work, he noticed many irregularities on the table top that needed more sanding to make it smooth.
2. The state of inconsistency: The irregularity of Nancy's working hour caused her to have problems sleeping, so she went to the doctor to see how this issue could be solved.
3. Behavior that is not in agreement with accepted rules or norms; inappropriateness: Jack's irregularities when doing business with other companies was noticed by his colleagues.