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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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 abnormality occurs when an embryo is damaged in the womb.
The motives behind this are to be treated as perfectly normal human, not as an
Another study found that mice with a genetic abnormality that eliminated their
  brown fat became obese even without overeating.
In some cases, an abnormality may occur as the cells as growing in the lab dish.
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