'third base' definitions:
Definition of 'third base'
(from WordNet)
noun
The base that must be touched third by a base runner in baseball; "he was cut down on a close play at third" [syn: third base, third]
noun
The fielding position of the player on a baseball team who is stationed near the third of the bases in the infield (counting counterclockwise from home plate); "he is playing third" [syn: third base, third]