Mental balance.
The condition of a system in which competing influences are balanced, resulting in no net change.
The state of a body at rest or in uniform motion in which the resultant of all forces on it is zero.
The state of a reaction in which the rates of the forward and reverse reactions are the same.
A violation of rules.
An object or event that is not regular or ordinary.
An instance of being irregular.
Irregular bowel movement (e.g. diarrhea or constipation).
The state or condition of being irregular, or the extent to which something is irregular.