A more thorough explanation:

Term: CO-
Definition: A prefix meaning "jointly" or "together with".
Examples: co-owner, co-defendant
Explanation: The prefix "co-" is used to indicate that two or more people or things are working together or sharing something. For example, a co-owner is someone who shares ownership of something with another person, while a co-defendant is someone who is jointly accused of a crime with another person. The prefix "co-" is often used in business and legal contexts to indicate joint ownership or responsibility.