Definitions:

1. Describes a deviation from what is usual, typical, or expected. NOUN
   • The abnormalcy of the weather patterns this year has scientists concerned about climate change.
2. Indicates something that is not in line with the usual standards or norms, whether it be behavior, physical condition, or other aspects of life. NOUN
   • The doctor noted the abnormalcy in the patient's test results, which required further investigation.
3. Refers to the state or condition of being abnormal. NOUN
   • Detecting an abnormalcy in the financial records, the auditor recommended a thorough investigation.
4. The state or condition of being abnormal, deviating from what is considered as normal or usual, typically in a way that is noticeable, undesirable, or problematic. NOUN
   • His behavior was marked by a degree of abnormalcy that worried his friends and family.

Synonyms:

• aberration
• abnormality
• anomaly
• idiosyncracy
• oddity
• peculiarity