| 1. | the state, fact, or quality of being singular. |
| 2. | a singular, unusual, or unique quality; peculiarity. |
| 3. | Mathematics. singular point. |
| 4. | Astronomy. (in general relativity) the mathematical representation of a black hole. |
| a point at which a given function of a complex variable has no derivative but of which every neighborhood contains points at which the function has derivatives. |