singularity

noun (plural singularities)

• 1 [mass noun] the state, fact, quality, or condition of being singular:he believed in the singularity of all cultures
• [count noun] a peculiarity or odd trait: it is a singularity of the book that it contains such a wealth of illustrations

• 2 Physics & Mathematics a point at which a function takes an infinite value, especially in space-time when matter is infinitely dense, such as at the centre of a black hole.