Circa (from Latin, meaning "around, about"), usually abbreviated c., ca or ca. (also circ. or cca.), means "approximately" in English, French, Spanish, Italian, Croatian, Serbian, German, Dutch, Romanian, Slovak, Slovenian, Czech, Norwegian, Swedish, and Danish (spelled cirka), usually referring to a date. Circa is widely used in genealogy and historical writing when the dates of events are not accurately known.
When used in date ranges, the term "circa" is applied before each approximate date, while dates without "circa" immediately preceding them are generally assumed to be known with certainty.
- 1732–1799, both years are known precisely.
- c. 1732 – 1799, only the end year is known accurately; the start year is approximate.
- 1732 – c. 1799, only the start year is known accurately; the end year is approximate.
- c. 1732 – c. 1799 both years are approximate.
- "circa – Definition and more from the free Merriam-Webster dictionary". Dictionary.com. Retrieved 16 July 2010.