Definitions from Wiktionary (circular)

▸ adjective:  Of or relating to a circle.
▸ adjective:  In the shape of, or moving in a circle.
▸ adjective:  Circuitous or roundabout.
▸ adjective:  Referring back to itself, so as to prevent computation or comprehension; infinitely recursive.
▸ adjective:  Distributed to a large number of persons.
▸ adjective:  (obsolete) Perfect; complete.
▸ adjective:  (archaic) Adhering to a fixed circle of legends; cyclic; hence, mean; inferior.
▸ noun:  An advertisement, directive or notice intended for mass circulation.
▸ noun:  (dated) A sleeveless cloak cut from a circular pattern.
▸ noun:  A shuttle bus with a circular route.
▸ verb:  To distribute circulars to or at.
▸ verb:  To extend in a circular direction.
▸ noun:  Short for circular letter. [A freely distributed letter or pamphlet on routine matters.]
▸ noun:  Short for circular file. [(idiomatic, humorous) The trash container; the wastebasket.]

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