BALLPARK

ballpark, park

(noun) a facility in which ball games are played (especially baseball games); “take me out to the ballpark”

Source: WordNet® 3.1

Etymology

Noun

ballpark (plural ballparks)

(US) A field, stadium or park where ball, especially baseball, is played.

(US, figuratively) The general vicinity; somewhere close; a broad approximation.

Adjective

ballpark (not comparable)

Approximate; close; on the right order of magnitude.

Verb

ballpark (third-person singular simple present ballparks, present participle ballparking, simple past and past participle ballparked)

To make a rough estimate of.

Source: Wiktionary