one-to-one
noun
Definitions
A personal relationship between two people.
adjective
Definitions
Matching each member of one set with exactly one member of another set.
Example: There is a one-to-one relationship between days with large cash shortages and his workdays.
Involving direct communication between two people. Used especially to refer to situations in which one person is teaching one other person.
(of a function) Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.