Abnormal meaning

ăb-nôrməl
Not typical, usual, or regular; not normal; deviant.
adjective
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Not normal; not average; not typical; not usual; irregular, esp. to a considerable degree.
adjective
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The definition of abnormal is a description that means unusual, odd or out of the ordinary.

An example of abnormal weather would be 20 inches of rain in a desert.

adjective
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Not conforming to rule or system; deviating from the usual or normal type. [First attested around the mid 19th century.]
adjective
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Of or pertaining to that which is abnormal, in particular, behaviour that deviates from norms of social propriety or accepted standards of mental health. [First attested around the early 20th century.]
adjective
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A person or object that is not normal.
noun
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Origin of abnormal

  • Alteration (influenced by ab–) of obsolete anormal from Medieval Latin anormālis blend of Late Latin abnormis (Latin ab- away from ab–1) (Latin norma rule gnō- in Indo-European roots) anōmalus anomalous

    From American Heritage Dictionary of the English Language, 5th Edition

  • ab- +‎ normal. First attested in 1835, replacing the earlier anormal and even earlier abnormous, from Latin abnormis (“departing from normal”), from either (ab- (“away from”) + norma (“rule, norm”)), or Ancient Greek ἀνώμαλος (anōmalos).

    From Wiktionary