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Mathematical singularity

in general a point at which a given mathematical object is not defined, or a point of an exceptional set where it fails to be well-behaved in some particular way, such as differentiability

Pronunciation
/maθəˈmatɪkəl sɪŋɡjʊˈlarɪti/
/ˌmæθəˈmædəkəl ˌsɪŋɡjəˈlɛrədi/