ab·nor·mal·i·ty | \ˌab-nər-ˈma-lə-tē, -(ˌ)nȯr-\
plural abnormalities

Definition of abnormality 

1 : something abnormal

2 : the quality or state of being abnormal

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Synonyms & Antonyms for abnormality


anomaly, freak, monster, monstrosity


average, norm, normal, par, standard

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Examples of abnormality in a Sentence

The test results showed several genetic abnormalities. There was some abnormality in his vision.

Recent Examples on the Web

About three in four people said the same in cases of fatal fetal abnormalities. Siobhán O'grady, Washington Post, "The U.K.’s top court says Northern Ireland’s abortion ban violates human rights," 7 June 2018 Sudden cardiac arrest typically occurs when an arrhythmia (heart rhythm abnormality) makes a person’s heart stop beating, according to the Mayo Clinic. Korin Miller, SELF, "Think You Know How to Do CPR? You Might Be Wrong," 31 May 2018 This abnormality is detected on the 12-lead ECGSTEMI care. Jennie Key, Cincinnati.com, "City wins appeal in public records lawsuit," 12 July 2018 Abortions are otherwise banned, even in cases of rape or fatal fetal abnormalities, and doctors who perform abortions outside these strict rules can be imprisoned. Amanda Erickson, Washington Post, "Ireland just eased its tough abortion laws, but don’t count on Northern Ireland following suit," 29 May 2018 No significant prior criminal record, depression and mental abnormalities, irresistible impulse. Tim Evans, Indianapolis Star, "Indiana death row holds 11 prisoners," 31 Jan. 2014 The chances of a tumor being cancerous increases with age, so pay special attention to any abnormalities in your older pup’s mammary glands. Texas A&m University, Houston Chronicle, "Pet Talk: Mammary tumors in dogs," 20 June 2018 Rose’s patients tend to have severe gait abnormalities associated with neurological conditions like cerebral palsy that often require bone and muscle surgery. Malia Wollan, New York Times, "How to Change Your Gait," 26 Jan. 2018 An additional 581 had neural tube defects, 262 had eye abnormalities and 662 had some other form of central nervous system dysfunction. Daniel Chang, miamiherald, "More birth defects seen in states with local Zika spread | Miami Herald," 25 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'abnormality.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of abnormality

1847, in the meaning defined at sense 1

History and Etymology for abnormality

abnormal entry 1 + -ity

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Last Updated

12 Oct 2018

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Time Traveler for abnormality

The first known use of abnormality was in 1847

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More Definitions for abnormality



English Language Learners Definition of abnormality

: something that is not usual, expected, or normal : something that is abnormal


ab·nor·mal·i·ty | \ˌab-nər-ˈma-lə-tē \
plural abnormalities

Kids Definition of abnormality

: something that is not usual, expected, or normal The X-ray showed no abnormalities.


ab·nor·mal·i·ty | \ˌab-nər-ˈmal-ət-ē, -(ˌ)nȯr- \
plural abnormalities

Medical Definition of abnormality 

1 : the quality or state of being abnormal

2 : something abnormal brain-wave abnormalities

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