What is the Italian 'circa' in English?

Answer 1

'About' is an English equivalent of 'circa'. But 'roughly, around, approximately' may be other equivalents. Sometimes the original Italian is used, particularly in the case of dates. In that case, an English language speaker may write ca. fifth century B.C.E. to mean 'about, approximately, around, roughly' the fifth century before the Christian or Common Era.