Meaning of Cartesian product

Carte'sian prod'uct

Pronunciation: [key]
— Math. Math.
  1. the collection of all ordered pairs of two given sets such that the first elements of the pairs are chosen from one set and the second elements from the other set: this procedure generalizes to an infinite number of sets.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.