“Circa” is a Latin term that denotes “approximately” or “around.” It is often used before a date to signify that the date is not precise but is rather an estimation. For instance, if you come across “circa 500 AD,” it indicates that the event or object being referred to happened or was created approximately in the year 500 AD, but the actual year could be somewhat earlier or later. In this context, “Circa” is frequently abbreviated as “c.”