third base

  1. the base to the right of the pitcher, the third of the four bases that a base runner attempts to reach safely
  2. the defensive position played by the third baseman

See third base in American Heritage Dictionary 4

noun
Baseball
  1. The third of the bases on the diamond counterclockwise from home plate; the last base to be reached by a runner before home plate.
  2. The position played by the third baseman.
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