noun, plural abnormalities.
an abnormal condition, state, or quality; irregularity; deviation.
an abnormal thing or event.
Also, abnormalcy.

1850–55; abnormal + -ity

anomaly, aberration, peculiarity, oddity, idiosyncrasy.
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World English Dictionary
abnormality (ˌæbnɔːˈmælɪtɪ)
n , pl -ties
1.  an abnormal feature, event, etc
2.  a physical malformation; deformity
3.  deviation from the typical or usual; irregularity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"quality of being abnormal," 1854; "abnormal feature or quality," 1859, from abnormal (q.v.). Earlier as abnormity (1731).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

abnormality ab·nor·mal·i·ty (āb'nôr-māl'ĭ-tē)
An anomaly, malformation, or difference from the normal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The telomeres act as caps that stop chromosomes deteriorating, or fusing with
  other chromosomes to cause abnormalities.
Wild frogs collected from areas with atrazine showed the same number of
Regular physical activity can help control blood lipid abnormalities, diabetes
  and obesity.
According to researchers dyscalculia is inherited, and specific abnormalities
  in the brain might be a cause.
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