| A | B |
| Cycle | a set of events or actions that happen again and again in the same order |
| Cyclical | happening in cycles |
| Cyclone | an extremely large, powerful, and destructive storm with very high winds |
| Circumference | the length of a line that goes around a circle |
| Circuit | the complete path that an electric current travels |
| Circumstance | a condition that surrounds or causes an event to happen |
| Circumvent | to get around something in a clever and sometimes dishonest way |
| Central | located in the center of a thing or place |
| Concentric | when two or more objects share the same center point |
| Eccentric | tending to act in strange or unusual ways |