diaphaneity
noun
di·a·pha·ne·i·ty (ˌ)dī-ˌa-fə-ˈnē-ə-tē 
ˌdī-ə-fə-,
-ˈnā-
: the quality or state of being diaphanous
Word History
Etymology
borrowed from Medieval Latin diaphanēitāt-, diaphanēitās, from Greek diaphanē-, stem of diaphanḗs "transparent, diaphanous" + Latin -itāt-, -itās - -ity
First Known Use
15th century, in the meaning defined above