ordered pair

noun
Mathematics. two quantities written in such a way as to indicate that one quantity precedes or is to be considered before the other, as (3, 4) indicates the Cartesian coordinates of a point in the plane.

Origin:
1950–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  ordered pair
Part of Speech:  n
Definition:  in mathematics, a pair of distinct elements or two ordered numbers, often used to match numbers in relations or functions
Dictionary.com's 21st Century Lexicon
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Example sentences
Students should also be able to add and subtract integers to each ordered pair
  to discover the new ordered pair.
Plots the location of an ordered pair in the first quadrant.
The combination of events and may be called a composite event, denoted by the
  ordered pair.
Now give them ordered pairs and tell them to rewrite the first ordered pair as
  red and the second as blue with colored pencils.
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