circular

Universal Words adjective, noun adjective 1 shaped like a circle; round: a circular building 2 moving around in a circle: a circular tour of the city on an open-topped bus * Using small circular movements, massage the muscles on either side of the spine. 3 (of an argument or a theory) using an idea or a statement to prove sth which is then used to prove the idea or statement at the beginning 4 (of a letter) sent to a large number of people circularity noun [U]: There is a dangerous circularity about this argument. noun a printed letter, notice or advertisement that is sent to a large number of people at the same time