anomaly/nml/nounnoun: anomaly; plural noun: anomalies1. something that deviates from what is standard, normal, or expected."there are a number of anomalies in the present system"synonyms: oddity, peculiarity, abnormality, irregularity, inconsistency, incongruity, aberration, quirk, rarity "the growth on the duck's bill is a harmless anomaly" 2. Astronomythe angular distance of a planet or satellite from its last perihelion or perigee