complete, full
The stones form a complete circle.
How long does it take for the dial to rotate through a full circle?

concentric
widening
The water rippled in widening circles around the fountain.

overlapping
a design of overlapping circles

tight
He turned the car in a tight circle.

half
Antarctic, Arctic, polar

draw, trace
describe (technical), go around in, go round in (esp. BrE)
If you follow the signs you find yourself going around in a circle.

form, make
cut out

in a/the circle
The children stood in a circle.
The planets move in circles around the sun.

circle of

the area of a circle, the circumference of a circle, the diameter of a circle, the radius of a circle
the centre/center of a circle, the middle of a circle

wide
She has a wide circle of acquaintances.

narrow, small
charmed, close, closed, elite, intimate, magic, select
He invited only a select circle of friends to the wedding.

exalted, high
immediate
They treat anyone outside their immediate circle with suspicion.

inner
He's joined the inner circles of the court early in his career.

academic, aristocratic, artistic, business, court, diplomatic, government, intellectual, literary, official, political, royal, scientific, social, theatrical circles
She moves in the highest social circles.

family

have
move in
My brother and I move in completely different circles (= we have very different friends).

join
expand, widen
You need to widen your circle of friends.

in a/the circle
Talk of religion was forbidden in the family circle.
friends in government circles

a circle of acquaintances, a circle of admirers, a circle of friends

dress, upper
My seat is in the front row of the dress circle.

slowly
The helicopter was circling slowly, very low.

overhead
A buzzard was circling overhead.

above
Several planes were circling above the airport.

around, round (esp. BrE)
The vultures were already circling around the dead animal.

circle sth in black, red, etc.
She circled her birthday in red on the calendar.

Circle is used with these nouns as the subject:
arm, bird, eagle, helicopter, seagull, shark, vulture

Circle is used with these nouns as the object:
earth, globe, prey