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one-to-one

[wuhn-tuh-wuhn]
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adjective
  1. Also one-one. (of the relationship between two or more groups of things) corresponding element by element.
  2. one-on-one.
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Origin of one-to-one

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for one-to-one

one-to-one

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