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circular (EN)
adjective, noun

adjective “circular”

base form circular (more/most)
  1. shaped like a circle or moving in a circle
    The circular track is perfect for runners.
  2. indirect or roundabout; not straightforward
    He gave a circular explanation that didn't clarify anything.
  3. (of an argument) referring indirectly back to itself
    The definition was circular and didn't help explain the term.

noun “circular”

singular circular, plural circulars
  1. an advertisement or notice distributed to many people
    The store sent out a circular announcing its sale.
  2. a bus or shuttle that follows a circular route
    We rode the circular to tour the city.