A more thorough explanation:

cotenant

One who owns or holds an interest in a property along with one or more other people.

• Two siblings who inherit a house from their parents and both have equal ownership of the property are cotenants.
• A group of friends who purchase a vacation home together and share ownership are cotenants.

These examples illustrate the definition of cotenant by showing that there are multiple people who have a shared interest in a property. In both cases, the cotenants have equal rights to the property and must make decisions together regarding its use, maintenance, and potential sale.