one-to-one

noun

1
Matching each member of one set with exactly one member of another set.
“There is a one-to-one relationship between days with large cash shortages and his workdays.”
2
Involving direct communication between two people. Used especially to refer to situations in which one person is teaching one other person.
3
(of a function) Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.

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