anomaly
B2CEFR level
35/100Rarity: fairly common
NeutralRegister
General noun
An observation that deviates from what a theory or expectation predicts.
A persistent anomaly in the orbit of Mercury eventually pointed the way to general relativity.
Business noun
A data point that deviates markedly from the expected pattern.
The fraud team flagged the anomaly the moment a dormant account processed fifty transactions in an hour.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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