Meaning 1 ►▼
place where baseball is played
Let's go to the ball park on Saturday and see the Mets play.
Meaning 2 ►▼
a general, rather than precise figure; a "ballpark" implies a rather large area.
I need a ball park figure on what the contract will cost.
The term ball park is derived from the time when baseball was played before a few people in parks rather than stadiums.