The definition of circa is about or approximately regarding dates.(preposition)
An example of circa is the estimated date on an antique desk at a museum.
See circa in Webster's New World College Dictionary
See circa in American Heritage Dictionary 4
preposition Abbr. c. or ca
Origin: Latin circā
Origin: , from circum, around (probably on the model of adverbs like intrā, within)
Origin: , from circus, circle; see circle.
Learn more about circa