circular

The word “circular” means shaped like or relating to a circle. In plain terms, round in shape, or (of an argument) going in a logical loop that proves nothing, or a mass-mailed flyer.

“Circular” is pronounced SUR-kyuh-luh (/ˈsɝ.kjə.lɚ/ in IPA).

Here is “circular” used in a sentence: “The table had a circular top.”

Words with a similar meaning to “circular” include annular, cyclic, discoid, round and rounded.

The opposite of “circular” — its antonyms — are sharp, square and thin.

Depending on how it is used, “circular” can be an adjective and a noun.

The word “circular” comes from Late Latin. From Old French circulier, from Late Latin circularis, from Latin circulus ("small circle").

“Circular” is a fairly common word in modern English, usually learned at around the B1 level.

A circular argument is one that assumes what it is trying to prove, so the conclusion is already contained in the premises. Because the reasoning loops back on itself, it never actually establishes anything new and fails to provide genuine support for its claim.

Both can describe a shape, but 'round' is broader and can mean spherical or generally curved, while 'circular' specifically means shaped like or relating to a circle. In figurative use, 'circular' also describes reasoning that loops back on itself, a meaning 'round' does not carry.

In this sense, a circular is a printed notice or advertisement sent to a large number of people. Retailers often use circulars to announce sales, promotions, or new products to many customers at once.

No. Describing an argument as 'circular' is a criticism, because it means the argument assumes what it is trying to prove and therefore never reaches a real conclusion. It signals a logical flaw rather than a strength.