The definition of circa is about or approximately regarding dates.
An example of circa is the estimated date on an antique desk at a museum.
[also in italics] about: used before an approximate date or figure: circa 1650
Origin of circaClassical Latin
prepositionAbbr. c. or ca
In approximately; about: born circa 1900.
Origin of circaLatin circā from circum around ( probably on the model of adverbs like intrā within ) from circus circle ; see circle .
- Used only before a date or measure, never after
From Latin circa.