Source : Webster's Revised Unabridged Dictionary (1913)

Earshot \Ear"shot`\, n.
   Reach of the ear; distance at which words may be heard.
   --Dryden.

Source : WordNet®

earshot
     n : the range within which a voice can be heard; "the children
         were told to stay within earshot" [syn: {earreach}, {hearing}]