Something that is circular is shaped like a circle.
例句
...a circular hole twelve feet wide and two feet deep...12英尺寬、2英尺深的圓坑Place your hands on your shoulders and move your elbows up, back, and down, in a circular motion.雙手置于肩上，肘部向上、向后、向下做圓圈運動。
ADJ
(旅程或路線)環行的，巡回的
A circular journey or route is one in which you go to a place and return by a different route.
例句
Both sides of the river can be explored on this circular walk.沿著這條環行線路走一圈，河的兩邊都可以看到。
ADJ-GRADED
(論證或理論)循環論證的
A circular argument or theory is not valid because it uses a statement to prove something which is then used to prove the statement.
N-COUNT
(同時發送給很多人的)廣告印刷品，通告
A circular is an official letter or advertisement that is sent to a large number of people at the same time.
例句
The proposal has been widely publicised in BBC-TV press information circulars sent to 1,800 newspapers.在英國廣播公司電視臺發送給1,800家報社的新聞通報中，這項提議得到了廣泛的宣傳。