Fair ball Meaning, Definition & Usage

  1. noun (baseball) a ball struck with the bat so that it stays between the lines (the foul lines) that define the width of the playing field

WordNet

Definitions
  1. . (Baseball) (a) A ball passing over the home base at the height called for by the batsman, and delivered by the pitcher while wholly within the lines of his position and facing the batsman. (b) A batted ball that falls inside the foul lines; called also a fair hit.

Webster 1913