Definitions for t-ballˈtiˌbɔl
Random House Webster's College Dictionary
a modified form of baseball or softball in which the ball is batted off an adjustable pole or stand.
Origin of T-ball:
A form of baseball, played by young children, in which the batter hits a ball placed on a tee rather than being thrown by a pitcher.
The lightweight wiffleball used to play a game of tee ball.