on or about

Definition from Nolo’s Plain-English Law Dictionary

A phrase used in a civil complaint or criminal charge that refers to a date or place. It is used to protect the person making the allegations of fact from being challenged as inaccurate. Thus, a complaint will read "On or about July 11, 2009, Defendant drove his vehicle negligently and without due care on or about the corner of Sunset and Vine Streets..."

Definition provided by Nolo’s Plain-English Law Dictionary.