The quality of being atypical or non-standard; a deviation from what is typical (rare/archaic variant).
From 'a-' (not) + 'typy' (from Greek 'typos,' meaning type). This appears to be a rarely used variant or archaic formation of 'atypicality,' following older patterns of noun formation from adjectives.
This word is so rare that even most dictionaries don't list it—it's the kind of word a medieval scholar might have invented that never quite caught on. It shows how language creators were always experimenting with word-building, mixing prefixes and suffixes to see what would stick.
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