B1 [C, + sing/pl verb] all the people of about the same age within a society or within a particular family: The younger generation smokes less than their parents did. There were at least three generations - grandparents, parents and children - at the wedding. It's our duty to preserve the planet for future generations. This painting has been in the family for generations.B2 [C, + sing/pl verb] a period of about 25 to 30 years, in which most human babies become adults and have their own children: A generation ago, home computers were virtually unknown.first, second, third, etc. generation › used to describe the nationality of someone belonging to the first, second, third, etc. group of people of the same age in the family to have been born in that country: She's a first-generation American (= she was born and raised in the US, but her parents were not).
› [C] a group of people who are about the same age within a society or within a particular family: the new/next generation Family-owned private firms don't usually aim to sell off the business; they pass it on to the next generation. the older/younger generation