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ANOM'ALY, noun [Gr. inequality, equal, similar.]

1. Irregularity; deviation from the common rule; thus oxen, the plural of ox, is an anomaly in grammar, as the regular plural would be oxes.

2. In astronomy, an irregularity in the motion of a planet, whereby it deviates from the aphelion or apogee.

3. In music, a false scale or interval.