third base definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- the base to the right of the pitcher, the third of the four bases that a base runner attempts to reach safely
- the defensive position played by the third baseman
third base definition by American Heritage Dictionary
- The third of the bases on the diamond counterclockwise from home plate; the last base to be reached by a runner before home plate.
- The position played by the third baseman.