sin‧gu‧lar‧i‧ty plural singularities
1 [countable] technical
an extremely small point in space that contains an extremely large amount of material and which does not obey the usual laws of nature, for example a black hole or the point at the beginning of the universe
2 [uncountable] old-fashioned
the quality of something that makes it unusual or strange:
He had an attractive singularity of viewpoint.