(British English)1 (North American Englishtraffic circle, rotary)a place where two or more roads meet, forming a circle that all traffic must go around in the same directionAt the roundabout, take the second exit.When entering a roundabout, give way to any traffic already on it. see also mini-roundabout2 (North American Englishmerry-go-round)a round platform for children to play on in a park, etc. that is pushed round while the children are sitting on it3(British English) = merry-go-round (1)