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Meaning of irrefrangible

ir•re•fran•gi•ble

Pronunciation: (ir"i-fran'ju-bul), [key]
— adj.
  1. not to be broken or violated; inviolable: an irrefrangible rule of etiquette.
  2. incapable of being refracted.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.