Something that deviates from what is standard, normal, or expected; an irregularity or unusual occurrence that stands out from the typical pattern.
From Greek 'anomalia' meaning 'unevenness' or 'irregularity,' from 'anomalos' (uneven). The prefix 'an-' means 'not' and 'homalos' means 'even.' It entered English through Latin in the 16th century.
An anomaly is like finding a purple sheep in a flock of white ones - it breaks the expected pattern. In data analysis, anomalies are the outliers that make scientists say 'Wait, that's weird!'
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