Adjective
single-valued (not comparable)
(mathematics) Of a function, associating a unique value of its range with each value of its domain.
The point estimators yield single-valued results, although this includes the possibility of single vector-valued results and results that can be expressed as a single function. Source: Internet
Configurations and the yields relation on configurations, which describes the possible actions of the Turing machine given any possible contents of the tape, are as for standard Turing machines, except that the yields relation is no longer single-valued. Source: Internet
However, the injective terminology is also sometimes used to mean "single-valued", i.e., each argument is mapped to at most one value. Source: Internet
The naturals are assumed to be closed under a single-valued " successor " function S. ordered Peano's original formulation of the axioms used 1 instead of 0 as the "first" natural number. Source: Internet