circle: a round shape that has no beginning or end

 

circlet:  a small circle; a ring or round band worn as an ornament, especially on the head

 

circuit:  a path for an electrical current to flow around

 

circulate:  to move around an area or a place, often returning to a starting point

 

circumference:  the distance all the way around a circle

 

circumflex:  bending around; curved

 

circumnavigate:  to go completely around

 

circumrotate:  to turn around like a wheel

 

circumspect:  careful; careful to look all around before doing something

 

circumvent:  to prevent something from happening by careful thinking; to get around something; to entrap