one-to-one

adjective

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

Examples of one-to-one in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The example given was CPT codes intended for one-to-one physical therapy services when the patients instead participated in group setting sessions. Paula Wethington, CBS News, 30 Mar. 2026 There’s not a nice one-to-one connection where El Niño equals wet winters in California and La Niña equals dry. Paul Rogers, Mercury News, 27 Mar. 2026 Air circulation is not a one-to-one replacement to properly insulated spaces to combat the extreme heat in the summer. Paige Moore, AZCentral.com, 20 Mar. 2026 The use of one-to-one devices is left to the discretion of each school. Kate Sequeira, Los Angeles Times, 19 Mar. 2026 See All Example Sentences for one-to-one

Word History

First Known Use

1873, in the meaning defined at sense 1

Time Traveler
The first known use of one-to-one was in 1873

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Cite this Entry

“One-to-one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one-to-one. Accessed 4 Apr. 2026.

Kids Definition

one-to-one

adjective
ˌwən-tə-ˈwən
: pairing each element of a set with one and only one element of another set
a one-to-one correspondence between the real numbers and the points on a straight line
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