Definition of one–to–one
1 : pairing each element of a set uniquely with an element of another set
2 : one-on-one 2
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First Known Use of one–to–one
1873
ONE–TO–ONE Defined for English Language Learners
one-to-one
play
adjective
Definition of one–to–one for English Language Learners
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: involving two people who are dealing with each other directly
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: perfectly matching one thing in a group to another thing in another group
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