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Meaning of partial ordering

par'tial or'dering

Pronunciation: [key]
— Math. Math.
  1. a relation defined on a set, having the properties that each element is in relation to itself, the relation is transitive, and if two elements are in relation to each other, the two elements are equal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.