A defect or malformation.
Any of various angular distances.
A failure of a classical symmetry due to quantum corrections.
Any event or measurement that is out of the ordinary regardless of whether it is exceptional or not.
Something or someone that is strange or unusual.
A deviation from a rule or from what is regarded as normal; an outlier.
A phrase or expression in which the component words contradict one another, often unintentionally, or are claimed to do so when seen from a particular point of view.