Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Allowing the pairing of each member of a class uniquely with a member of another class.
  • adjective Mathematics Relating to or being a correspondence between two sets that assigns to each member of one set exactly one member of the other set.

from The Century Dictionary.

  • Same as one-one.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A personal relationship between two people.
  • adjective Matching each member of one set with a member of another set.
  • adjective chiefly UK Involving direct communication between two people. Used especially to refer to situations in which one person is teaching one other person.
  • adjective mathematics, of a function Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective used of relations such that each member of one set is associated with one member of a second set

Etymologies

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Examples

  • About fifteen years ago, marketers started using the term "one-to-one marketing" or 1:1 marketing to describe a CRM strategy that emphasized this kind of highly personalized interaction.

    Forbes.com: News Lisa Arthur 2011

  • More than 600 public school districts have begun what they call "one-to-one" programs, in which at least one classroom of students is getting iPads for each child to use throughout the day.

    SFGate: Top News Stories By STEPHANIE REITZ 2011

  • Apple officials say they know of more than 600 districts that have launched what are called "one-to-one" programs, in which at least one classroom of students is getting iPads for each student to use throughout the school day.

    Many U.S. schools adding iPads, trimming textbooks 2011

  • Apple officials say they know of more than 600 districts that have launched what are called "one-to-one" programs, in which at least one classroom of students is getting iPads for each student to use throughout the school day.

    Many U.S. schools adding iPads, trimming textbooks 2011

  • Apple officials say they know of more than 600 districts that have launched what are called "one-to-one" programs, in which at least one classroom of students is getting iPads for each student to use throughout the school day.

    Yahoo! News: Business - Opinion 2011

  • Apple officials say they know of more than 600 districts that have launched what are called "one-to-one" programs, in which at least one classroom of students is getting iPads for each student to use throughout the school day.

    Apple Hot News 2011

  • It wasn't too long ago that the parity pontificators were out in full force claiming that the European currency would trade one-to-one with the U.S. dollar.

    Michael Pento: Bernanke Has Buried the Buck Michael Pento 2010

  • Maybe working with a writing coach one-to-one would suite you better?

    The SECRET of Becoming a Top Blogger? | Write to Done 2010

  • "There is a one-to-one relationship," Mr. Pijbes adds.

    The Art World's Yearly Pilgrimage Margaret Studer 2011

  • So there is fructose in table sugar, too, in a one-to-one ratio with glucose.

    David Katz, M.D.: HFCS Name Change: Good, Bad or In Between? M.D. David Katz 2010

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