1. Together, jointly, with: This is the most common meaning of "co". It indicates that something is done or shared by two or more people or entities.
* Examples:
* Co-worker: Someone who works with you in the same workplace.
* Co-author: Someone who writes a book or article with another person.
* Co-operation: Working together towards a common goal.
* Co-founder: Someone who starts a company or organization with another person.
2. In the same place, or in a relationship with: This meaning is less common than the first one.
* Examples:
* Co-ordinate: To arrange things in a way that they work together.
* Co-existing: Living or existing in the same place or time.
* Co-habitation: Living together in a romantic relationship.
3. Abbreviation for "company": This meaning is specific to certain words, and it's often used in business.
* Examples:
* Co. Ltd.: This stands for "Company Limited" and is often used at the end of a company name.
* CEO: Chief Executive Officer.
It's important to consider the context of the word to understand the specific meaning of "co". If you're unsure, looking up the word in a dictionary can help clarify its meaning.