all of the people born and living at about the same time, regarded collectively
A generation can mean any group that is sorted by the time they were created.
In a family, a generation means all the people on one level of a family tree. For example, your brothers, sisters and cousins are in the same generation as you.
In populations of people, a “generation” means groups of people born in different periods of time. Each generation lasts for the average amount of time between the birth of parents, and the birth of their children.
”Generation” can also mean a wave or series of something, like a generation of car model (2nd generation for example). Anything that is created in waves can have generations or editions.