something singular, e.g. a peculiarity
something singular, e.g.:
a separate unit
an unusual or distinctive trait; a peculiarity
Her eyes were dark, and they had the singularity of seeming at once dull and restless — Henry James
the state or quality of being singular
in mathematics, a point at which a function is undefined, e.g. by reason of division by zero or non-existence of a derivative
in astronomy, a point of infinite density at the centre of a black hole