Learner's definition of GENERATION
1 a : a group of people born and living during the same time
b : the people in a family born and living during the same time
She was worshipped by a generation of moviegoers.
He was a hero to generations of students.
We need to preserve these resources for future generations.
His books are popular among members of the younger/older generation.
(US) The current generation is changing the way things are done. = (Brit) The current generation are changing the way things are done.
That family has lived in the same house for four generations.
The house has been passed down in the family from generation to generation.
first- and second-generation immigrants [=people who immigrated and their children]
2 [count] : the average length of time between the birth of parents and the birth of their children
She's a generation [=around 20–30 years] older than most of her colleagues.
He has held that position for a generation.
No one dreamed that such things would be possible a generation ago.
3 [count] : a group of things that are developed from an earlier type 4 [noncount] : the act or process of making or producing something : the act or process of generating something