Adjective

(en adjective)

Of or relating to a circle.

In the shape of, or moving in a circle.

* , chapter=5

, title= The Mirror and the Lamp , passage=Here, in the transept and choir, where the service was being held, one was conscious every moment of an increasing brightness; colours glowing vividly beneath the circular chandeliers, and the rows of small lights on the choristers' desks flashed and sparkled in front of the boys' faces, deep linen collars, and red neckbands.}}

Circuitous or roundabout.

Referring back to itself, so as to prevent computation or comprehension; infinitely recursive.

circular reasoning

Your dictionary defines "brave" as "courageous", and "courageous" as "brave". That's a circular definition.

a circular formula in a spreadsheet

Distributed to a large number of persons.

* Hallam

a proclamation of Henry III., doubtless circular throughout England

(obsolete) Perfect; complete.

* Massinger

A man so absolute and circular / In all those wished-for rarities that may take / A virgin captive.

(archaic) Adhering to a fixed circle of legends; cyclic; hence, mean; inferior.

* Dennis

Had Virgil been a circular poet, and closely adhered to history, how could the Romans have had Dido?

Adjective

(en adjective)

Shaped like a triangle.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=Foreword citation , passage=A very neat old woman, still in her good outdoor coat and best beehive hat, was sitting at a polished mahogany table on whose surface there were several scored scratches so deep that a triangular piece of the veneer had come cleanly away, […].}}

Of, or pertaining to, triangles.

Having a triangle as a base; as, a triangular prism, a triangular pyramid.

Having three elements or parties; trilateral, tripartite.