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Meaning of antimension

an•ti•men•si•on

Pronunciation: (än"dē-mēn'sē-ôn Eng. an"ti-men'sē-on"), [key]
— pl. -si•a
  1. a consecrated linen or silk cloth, kept on an altar, to which is sewn a linen or silk bag containing relics of saints.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.