Ball-park is a term which means "approximately" or "roughly". There are many synonyms for this term, which people use interchangeably. Some of the commonly used synonyms are estimation, approximation, in the vicinity of, close to, around, near, in the neighborhood of, within range, more or less, proximate, and so forth. All these synonyms convey the same meaning of giving an approximate number or value. People use these words often in situations where they are not quite sure about the accuracy of the figures or data they are presenting. In general, these synonyms are used to describe an estimate or prediction, which may not be exact but is close enough to the actual value.