Definition of third base in US English:

third base


  • 1Baseball. The third of the four bases which the batter must touch in succession in order to score a run.

  • 2Slang (chiefly North American). The third of four notional stages of sexual activity, usually characterized as the stimulation of the genitals or (in later use) oral sex.


Mid 19th century; earliest use found in By-laws & Rules Knickerbocker Base Ball Club. From third + base.


third base

/ˌθəːd ˈbeɪs/