| Term | Definition |
| coexist | to live together without problems |
| cohesive | sticking together |
| coincidence | a sequence of events happening together |
| combine | to put two things together |
| commiserate | to get together with someone to feel sadness |
| committee | a group of people who meet together to discuss a topic |
| communication | talking with someone and discussing something together |
| community | a place where people live together |
| compare | to put things together to see how they are the same |
| compatible | able to live together and get along |