listener

plural listeners

1. Someone who listens, especially to a speech or a broadcast.

   […] she would set herself going, telling the most interminable stories, until the last listener was fast asleep[…]

   1904, William Henry Hudson, “chapter 2”, in Green Mansions

   1 more example

   And then her words tumbled out in a passion of communication, as though she hurried before her listener could be taken away.

   1937, John Steinbeck, Of Mice and Men

   Synonyms: auditor

2. chiefly JavacomputingA function that runs in response to an event; an event handler.
3. slangA person's ear.

   Fancy Gazette, quoted in 1823, John Badcock, Slang, a Dictionary of the Turf, the Ring, the Chase, the Pit, of Bon-Ton, and the Varieties of Life Gas now planted his favourite hit under the left listener of his antagonist, which sent him to dorse.

4. formalA musical anthology.