This is the 1792nd most frequent Catalan word.
circular
To move or travel around, often in a loop or circuit.
Here, 'circular' is used as a verb meaning 'to move or travel around, especially in the context of vehicles.'
El cotxe està en moviment i comença a circular per la carretera.
The car is in motion and starts to circulate on the road.
In this case, 'circular' is used as an adjective meaning 'distributed to multiple recipients as part of a generalized communication.'
He rebut una notificació circular que s'ha enviat a tot el personal.
I received a circular notification that was sent to all the staff.
Here, 'circular' is an adjective describing something having the shape of a circle or circular figure.