subaudition
noun
sub·au·di·tion ˌsəb-ȯ-ˈdi-shən 
: the act of understanding or supplying something not expressed : a reading between the lines
Word History
Etymology
Late Latin subaudition-, subauditio, from subaudire to understand, from Latin sub- + audire to hear — more at audible
First Known Use
1615, in the meaning defined above