Learner's definition of CIRCUS
1 : a traveling show that is often performed in a tent and that typically includes trained animals, clowns, acrobats, etc.
— often used before another noun
He worked for a small circus.
We're going to the circus.
She always wanted to join the circus. [=to become a performer in a circus]
2 informal : a situation or event that is very busy, lively, and confusing and that attracts a lot of attention — usually singular 3 British : a circular area where several streets meet — usually used in proper names 4 : a large outdoor theater in ancient Rome where shows and sports events were held