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An approximate number; an estimate. Do you have a ballpark figure for the cost of the renovations? That's just a ballpark figure—they don't know exactly how many people will be attending the event.
Fig. an estimate; an off-the-cuff guess. I don't need an exact number. A ballpark figure will do.
An acceptable, roughly accurate approximation, as in I know you can't tell me the exact cost; just give me a ballpark figure. This term alludes to a baseball field, which is always an enclosed space. The expression is basically an extension of the somewhat earlier in the ballpark, meaning within a reasonable range, and out of the ballpark, beyond a reasonable range. [Slang; late 1960s]
a ballpark figureor
a ballpark estimate
A ballpark figure or a ballpark estimate is an approximate figure or quantity. Note: A ballpark is a park or stadium where baseball is played. But what are we talking about here — a few thousand, millions, two bucks? Give me a ballpark figure. I think just in a ballpark estimate — about 60-40. Sixty would support, 40 percent would be opposed.