audibility

From audible +‎ -ity.

audibility (countable and uncountable, plural audibilities)

1. The quality of being heard or understood; the degree to which a thing is audible.
   • 1962 March, Brian Haresnape, “Design in 1961—a Retrospect”, in Modern Railways, page 191:

     At a later date in production, the Western Region requested that the two-tone air horns should be placed on the cab roof instead of behind the buffer beam, in order to increase audibility.

   Synonym: audibleness