* A group of people born and living at about the same time: For example, "Baby Boomers," "Millennials," or "Generation Z."
* A stage in the development of something: This is often used in the context of technology, like "the next gen of consoles" or "the latest gen of smartphones."
The specific meaning of "gen" will depend on the context in which it is used.
Do you have any further questions about "gen" or a specific context in which you encountered it?