Definition:Singular


 * A Singular Boolean Function or Singular Proposition: in propositional logic, a propositional function whose fiber of truth is a singleton set.


 * A Singular Conjunction: propositional logic, a conjunction of $k$ literals that includes just one conjunct of each complementary pair of literals.


 * A Singular Statement: in predicate logic, a statement made about an object which is identified by means of a proper name.