ma·te·ri·al·i·ty /məˌtɪriˈæləti/
  實質性,具體性,有形
  Ma·te·ri·al·i·ty n.
  1. The quality or state of being material; material existence; corporeity.
  2. Importance; as, the materiality of facts.
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  materiality
       n 1: relevance requiring careful consideration [ant: immateriality]
       2: the quality of being physical; consisting of matter [syn: physicalness,
           corporeality] [ant: immateriality, immateriality]