The quality or state of being abnormal; the degree to which something deviates from what is considered normal.
From abnormal + -ness (Old English suffix -nes, forming abstract nouns from adjectives). This creates a noun expressing the abstract quality itself rather than instances of it.
Unlike abnormality (which names specific abnormal things), abnormalness refers to the essence of being abnormal—it's wonderfully abstract and philosophical in a way that helps us discuss difference itself.
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