a tract of land where ball games, especially baseball, are played.
a baseball stadium.
Informal. being an approximation, based on an educated guess: Give me a ballpark figure on our total expenses for next year.
in the ballpark, Informal. within reasonable, acceptable, or expected limits: The price may go up another $10, but that's still in the ballpark.
Also, ball park.

1895–1900, Americanism; ball1 + park Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ballpark (ˈbɔːlˌpɑːk)
1.  (US), (Canadian) a stadium used for baseball games
2.  informal
 a.  approximate range: in the right ballpark
 b.  (as modifier): a ballpark figure
3.  informal a situation; state of affairs: it's a whole new ballpark for him

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"baseball stadium," 1899, from (base)ball + park. Fig. sense of "acceptable range of approximation" first recorded 1960, originally referring to area within which a spacecraft was expected to return to earth; the reference is to broad but reasonably predictable dimensions.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For an inside look at the ballpark, take a stadium tour.
Even now, prices are in the same ballpark as conventional construction.
Ballpark calculations are a powerful way of getting to grips with a problem.
She left the ballpark with a concussion and a broken jaw.
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