What term is used for an event that signifies a notable deviation?

The term "abnormality" is used to refer to an event that signifies a notable deviation from what is considered normal or typical. In various contexts, such as medical, statistical, or behavioral fields, an abnormality indicates that something is different from the usual pattern or expectation. This term captures the essence of a significant departure from standard conditions, making it essential for identifying irregularities that may require further investigation or action.

In contrast, the other options do not align with the notion of deviation. "Accordance" implies agreement or conformity with established standards, rules, or expectations, suggesting a state of normalcy. "Abridgment" refers to the act of shortening or reducing something, typically literature or texts, without addressing the concept of deviation. Finally, "absolution" relates to the release from guilt, obligation, or punishment, which does not pertain to the idea of deviation. Thus, "abnormality" is the most appropriate term for denoting a significant deviation.