- an abnormal feature, event, etc
- deviation from the typical or usual; irregularity
WordReference Random House Learner's Dictionary of American English © 2026
ab•nor•mal /æbˈnɔrməl/USA pronunciation
adj.
ab•nor•mal•ly, adv. See -norm-.
WordReference Random House Unabridged Dictionary of American English © 2026- not normal or usual:His wild behavior that day was clearly abnormal.
ab•nor•mal•ly, adv. See -norm-.
ab•nor•mal•i•ty
(ab′nôr mal′i tē),USA pronunciation n., pl. -ties.
WordReference Random House Unabridged Dictionary of American English © 2026- an abnormal condition, state, or quality;
irregularity;
deviation. - an abnormal thing or event.
- abnormal + -ity 1850–55
- anomaly, aberration, peculiarity, oddity, idiosyncrasy.
ab•nor•mal
(ab nôr′məl),USA pronunciation adj.
ab•nor′mal•ly, adv.
ab•nor′mal•ness, n.
- 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.
- Medieval Latin anōrmālus, variant of anōmālus anomalous influenced by Latin norma norm
- 1850–55; ab- + normal; replacing anormal
ab•nor′mal•ness, n.
- 1. anomalous, aberrant, irregular, deviant, unnatural, odd. See irregular.
Collins Concise English Dictionary © HarperCollins Publishers::
abnormality /ˌæbnɔːˈmælɪtɪ/ n ( pl -ties)