Definition of "one-to-one" [one-to-one]

• Allowing the pairing of each member of a class uniquely with a member of another class. (adjective)
• Mathematics Relating to or being a correspondence that assigns to different members of one set different members of another set. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "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."
• "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."
• "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."