Definition from Wiktionary, a free dictionary

From circus (“‘a circle’”)

circum (not comparable)

1. about, around
2. in a circle, all around, on both sides

circum (+ accusative)

1. about, around, near
2. through, among, to
3. nearby, at, in the neighborhood of

• circā
• circus

• “circum” in Charlton T. Lewis & Charles Short (1879), A Latin Dictionary (Oxford: Clarendon Press)