something that deviates from what is standard, normal, or expected.
there are a number of anomalies in the present system
sinonim: oddity, peculiarity, abnormality, irregularity, inconsistency, incongruity, aberration, quirk, rarity
the angular distance of a planet or satellite from its last perihelion or perigee.
Such processing efforts have led to determinations of satellite magnetic anomalies of the Earth.