A more thorough explanation:

Definition: A fellow is someone who is joined with another person in some legal status or relation. It can also refer to a member of a college, board, corporate body, or other organization.

• John and Jane are fellows in their law firm.
• As a fellow of the Royal Society of Arts, she was invited to speak at the conference.
• He was elected as a fellow of the American Academy of Pediatrics.

These examples illustrate the two different meanings of the term "fellow." In the first example, John and Jane are both lawyers who work together in the same law firm. They are fellows in the sense that they share a legal status and work together in a professional capacity.

In the second and third examples, the term "fellow" refers to membership in a specific organization. In these cases, being a fellow is an honor that is bestowed upon individuals who have achieved a certain level of expertise or accomplishment in their field. It is a way of recognizing their contributions and expertise.