Oxford Advanced American Dictionary

Definition of circle noun from the Oxford Advanced Learner's Dictionary

Oxford3000

circle

noun
circle pronunciation English ˈsɜːkl circle pronunciation American ˈsɜːrkl
 
1 a completely round flat shapeCut out two circles of paper. see also semicircle2 the line that forms the edge of a circleDraw a circle.She walked the horse round in a circle. see also Antarctic Circle, Arctic Circle, turning circle3 a thing or a group of people or things shaped like a circlea circle of trees/chairsThe children stood in a circle. see also corn circle, crop circle4 (British English) (also balcony North American English, British English) an upper floor of a theatre or cinema/movie theater where the seats are arranged in curved rowsWe had seats in the circle. see also dress circle5 a group of people who are connected because they have the same interests, jobs, etcthe family circleShe's well known in theatrical circles.a large circle of friends see also charmed circle, inner circle, vicious circle
Idioms

come, turn, etc. full circle

to return to the situation in which you started, after a series of events or experiences

go round in circles

to work hard at something or discuss something without making any progress

run round in circles

(informal) to be busy doing something without achieving anything important or making progress