| Term | Definition |
| Circuit | the regular journey around a territory by a person performing duties. |
| Circuitous | roundboat; winding. |
| Circumference | a line carried around; the outer boundary line around a circular area |
| Circumlocution | a roundabout |
| Circumnavigate | to sail around |
| Circumscribe | to write a line around the bounds; to limit; to confine |
| Circumspect | cautious; careful to consider possible consequences |
| Circumstance | something standing around; a fact or event accompanying another fact or event |
| Circumvent | to come around; to get aroundor to overcome by artful maneuvering; to pervent |