A group of organisms having a common parent or parents and comprising a single level in line of descent.

1. Any one of three groups used to historically classify computers according to their electronic hardware components, logical organization and software, or programming techniques; computers are thus known as first-, second- , or third-generation; a particular computer may possess characteristics of all generations simultaneously.

2. One of a family of data sets, related to one another in that each is a modification of the next most recent data set.