Definition of circulars:
(adj) :
Of or relating to a circle.
(adj) :
In the shape of, or moving in a circle.
(adj) :
Distributed to a large number of persons.
(n) :
An advertisement, directive or notice intended for mass circulation.
(adj) :
Circuitous or roundabout.
(adj) :
Referring back to itself, so as to prevent computation or comprehension; infinitely recursive.