'abnormity' originates from Latin, specifically the word 'abnormis,' where 'ab-' meant 'away from' and 'norma' meant 'rule or pattern.'

'abnormis' transformed into the Medieval Latin word 'abnormitas,' and eventually became the modern English word 'abnormity.'

Initially, it meant 'deviation from a rule or pattern,' and this meaning has largely remained the same in modern usage.