Dictionary.net

(of quantities) imprecise but fairly close to correct; "lasted approximately an hour"; "in just about a minute"; "he's about 30 years old"; "I've had about all I can stand"; "we meet about once a month"; "some forty people came"; "weighs around a hundred pounds"; "roughly $3,000"; "holds 3 gallons, more or less"; "20 or so people were at the party"

This phrase, inserted in a conveyance of land immediately after the statement of the quantity of land conveyed, means that such statement is uot to be taken as a warranty of the quantity, but only an approximate estimate, and that the tract or parcel described is to pass, without regard to an excess or deficiency in the quantity it actually contains. See Brawley v. U. S