the.com/abnormality

means A quality or feature that deviates from what's typical, normal, or expected — the outlier trait or condition that stands apart from the baseline.

from Built from Latin 'ab' (away from) plus 'norma' (a carpenter's square, a rule or pattern) — so literally 'away from the square,' away from the standard everything else is measured against. The 'b' in 'abnormal' actually crept in later by confusion with the unrelated Greek-rooted word 'anomalous'; the earlier English form was 'anormal,' straight from French. So even the word's own history is a little bit irregular — fittingly.