1. The base that must be touched third by a base runner in baseball
   "he was cut down on a close play at third base";
   - third
    
2. 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 base";
   - third
    
3. [US, informal] Sexual touching of genitals; mutual masturbation
   "The couple got to third base before deciding to slow things down"

Derived forms: third bases

Type of: bag, base, position

Part of: baseball team

Encyclopedia: Third base