Source : Webster's Revised Unabridged Dictionary (1913)

Materiality \Ma*te`ri*al"i*ty\, n. [Cf. F. mat['e]rialit['e].]
   1. The quality or state of being material; material
      existence; corporeity.

   2. Importance; as, the materiality of facts.

Source : WordNet®

materiality
     n 1: relevance requiring careful consideration [ant: {immateriality}]
     2: the quality of being physical; consisting of matter [syn: {physicalness},
         {corporeality}] [ant: {immateriality}, {immateriality}]