[ ab-nawr-muhl ]
/ æbˈnɔr məl /


not normal, average, typical, or usual; deviating from a standard: abnormal powers of concentration; an abnormal amount of snow; abnormal behavior.
extremely or excessively large: abnormal profit.

Origin of abnormal

1850–55; ab- + normal; replacing anormal < Medieval Latin anōrmālus, variant of anōmālus anomalous influenced by Latin norma norm

Related forms

ab·nor·mal·ly, adverbab·nor·mal·ness, nounsu·per·ab·nor·mal, adjectivesu·per·ab·nor·mal·ly, adverb

Can be confused

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

Examples from the Web for abnormal

British Dictionary definitions for abnormal


/ (æbˈnɔːməl) /


not normal; deviating from the usual or typical; extraordinary
informal odd in behaviour or appearance; strange

Derived Forms

abnormally, adverb

Word Origin for abnormal

C19: ab- 1 + normal, replacing earlier anormal from Medieval Latin anormalus, a blend of Late Latin anōmalus anomalous + Latin abnormis departing from a rule
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