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Meaning of idempotent

i•dem•po•tent

Pronunciation: (ī'dum-pōt'nt, id'um-), [key]
— Math. Math.
—adj.
  1. unchanged when multiplied by itself.
—n.
  1. an idempotent element.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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