Dictionary

one–to–one

adjective \ˌwən-tə-ˈwən, -də-\

: involving two people who are dealing with each other directly

: perfectly matching one thing in a group to another thing in another group

Full Definition of ONE-TO-ONE

1
:  pairing each element of a set uniquely with an element of another set
2
:  one-on-one 2

First Known Use of ONE-TO-ONE

1873

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