about, approximately
Wir werden uns wahrscheinlich um circa drei Stunden verspäten.
We’ll probably be about three hours late.
In about two weeks.
Ich werde circa einen Monat in Boston sein.
I’ll be in Boston for about a month.
Na ja, Ray Harris verschwand circa zwei Monate nachdem Markum wieder frei war.
Well, Ray Harris disappeared about two months after Markum was released.
— Mystic River (2003)