1. deviating from or inconsistent with the common order, form, or rule; irregular; abnormal: Advanced forms of life may be anomalous in the universe.
  2. not fitting into a common or familiar type, classification, or pattern; unusual: He held an anomalous position in the art world.
  3. incongruous or inconsistent.
  4. Grammar. irregular.


  1. deviating from the normal or usual order, type, etc; irregular, abnormal, or incongruous

1640s, from Late Latin anomalus, from Greek anomalos “uneven, irregular” (see anomaly). Related: Anomalously; anomalousness.

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