A single step or stage in the succession of natural descent; a rank or degree in genealogy, the members of a family from the same parents, considered as a single unit. [from 14th c.]
The average amount of time needed for children to grow up and have children of their own, generally considered to be a period of around thirty years, used as a measure of time. [from 17th c.]
A set stage in the development of computing or of a specific technology. [from 20th c.]
(geometry) The formation or production of any geometrical magnitude, as a line, a surface, a solid, by the motion, in accordance with a mathematical law, of a point or a magnitude, by the motion of a point, of a surface by a line, a sphere by a semicircle, etc.
A specific age range in which each person in that range can relate culturally to one another.
A version of a form of pop culture which differs from later or earlier versions.
