ballpark
 oxford
 views  updated Jun 11 2018ball·park  / ˈbôlˌpärk/ •
n. a baseball stadium or field. ∎ inf.  a particular area or range: we can make a pretty good guess that this figure's in the ballpark.•
adj.  inf.  (of prices or costs) approximate; rough: the ballpark figure is $400–500.
 The Oxford Pocket Dictionary of Current English