Also one-one. (of the relationship between two or more groups of things) corresponding element by element.

Origin of one-to-one

First recorded in 1870–75 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for one-to-one

Contemporary Examples of one-to-one

  • The very fact of depicting at one-to-one carries special representational weight.

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    Magic Bus

    Blake Gopnik

    July 3, 2012

  • “The closest I came to discussing this was in February 2009 when I had a one-to-one meeting,” Coltart said.

  • One-to-one relationships beg for attention as your ruler Pluto is challenged by Venus.

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    Zodiac Beast: April 24-30

    Starsky + Cox

    April 23, 2011

  • Here are a few basic suggestions: In baking, sorghum can be used in place of molasses on a one-to-one basis.

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    Pancakes' New Topper

    Stacey Slate

    December 8, 2009

Historical Examples of one-to-one

British Dictionary definitions for one-to-one



(of two or more things) corresponding exactly
denoting a relationship or encounter in which someone is involved with only one other personone-to-one tuition
maths characterized by or involving the pairing of each member of one set with only one member of another set, without remainder


a conversation, encounter, or relationship between two people
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012