noun
generation
jen-uh-RAY-shuhn/ˌdʒenəˈreɪʃn/
A cohort occupying one stage in a succession of descendants.
The three teenagers belong to the same generation and pose for a photograph.

Etymology
The act of bringing forth children connects to descendants at the same stage in a family line. That grouping underlies the sense of people born at about the same time.
In context
I am the member of the first generation ever to be able to say that population of the world tripled not doubl tripled in my lifetime
More examples
- Three generations of our family live under one roof.
- The younger generation often has different ideas about work.
- The latest generation of this phone has a better camera.
Forms
generation · generations
generational adjective — Relating to a generation or differences between generations.
Similar words
- cohort
- Groups people by shared characteristics, not necessarily birth period.
- contemporaries
- People living at the same time, regardless of age.