one-to-one

adjective

ˌwən-tə-ˈwən 

-də-

1

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

2

: one-on-one sense 2

Examples of one-to-one in a Sentence

Recent Examples on the Web

For example, prior to the first day of school this August, YouTube will be banned on one-to-one devices. — Paris Barraza, USA Today, 4 Aug. 2026

Philadelphia also ensures the lactose-free version is a one-to-one swap for its original cream cheese, meaning it can be used in any recipe that calls for cream cheese. — Claire Hoppe Norgaard, Better Homes & Gardens, 30 July 2026

It has long been known that, for the first three strands of a braid, the matrices are always faithful, meaning there is a one-to-one relationship among them. — Lyndie Chiou, Scientific American, 24 July 2026

The goal was to surpass the old record of 2,577 one-to-one swaps. — Kristie Keleshian, CBS News, 12 July 2026

Word History

First Known Use

1873, in the meaning defined at sense 1

Rhymes for one-to-one

• anyone
• everyone
• megaton
• overdone
• overrun
• begun
• grandson
• gudrun
• handgun
• homespun
• outdone
• outrun

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