absorptivityEnglishOxford New American Dictionaryabsorptivity /ˌabzôrpˈtivədē, , ˌæbzɔrpˈtɪvədi , ˌəbzôrpˈtivədē, , ˌəbzɔrpˈtɪvədi , ˌabsôrpˈtivədē, , ˌæbsɔrpˈtɪvədi , ˌəbsôrpˈtivədē, ˌəbsɔrpˈtɪvədi / ▸ noun the degree to which something absorbs energy, a liquid, or another substance: the materials have little difference in X-ray absorptivity.