Definition of abnormal

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< abnegation

abnormality >

ab·nor·mal    (b-nôrml) KEY 

ADJECTIVE:

Not typical, usual, or regular; not normal; deviant.

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ETYMOLOGY:
Alteration (influenced by ab-¹), of obsolete anormal from Medieval Latin anormlis, blend of Late Latin abnormis (Latin ab-, away from; see ab-¹ + Latin norma, rule; see gn- in Indo-European roots), and anmalus ; see anomalous

OTHER FORMS:
ab·normal·ly(Adverb)