noun, plural ab·nor·mal·i·ties.

an abnormal condition, state, or quality; irregularity; deviation.
an abnormal thing or event.

Nearby words

  1. abney level,
  2. abnormal,
  3. abnormal occlusion,
  4. abnormal psychology,
  5. abnormalcy,
  6. abnormalize,
  7. abnormally,
  8. abnormity,
  9. abo,
  10. abo hemolytic disease of newborn

Origin of abnormality

First recorded in 1850–55; abnormal + -ity

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for abnormality

British Dictionary definitions for abnormality


noun plural -ties

an abnormal feature, event, etc
a physical malformation; deformity
deviation from the typical or usual; irregularity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for abnormality



"quality of being abnormal," 1854; "abnormal feature or quality," 1859, from abnormal + -ity. Earlier as abnormity (1731).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for abnormality




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.