| third base | The runner stole third base. |
| third base | (n) the base that must be touched third by a base runner in baseball, Syn. third, Example: he was cut down on a close play at third |
| third base | (n) 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), Syn. third, Example: he is playing third |
| third baseman | (n) (baseball) the person who plays third base, Syn. third sacker |