(n): (plural) any group of human beings (men or women or children) collectively
(n): group of genetically related organisms constituting a single step in the line of descent
(n): a group of plants or animals
(n): the normal time between successive generations
(n): an amount of time
(n): a stage of technological development or innovation
(n): any distinct time period in a sequence of events
(n): a coming into being
(n): the event consisting of the start of something
(n): the production of heat or electricity
(n): (economics) manufacturing or mining or growing something (usually in large quantities) for sale
(n): the act of producing offspring or multiplying by such production
(n): the sexual activity of conceiving and bearing offspring
I think it's usually considered roughly 20-25 years. But not in terms of identity--that's what the op-ed wars are about--and more in terms of ... I don't know ... genealogy.
I don't think you can, which is why we have those interminable op-ed wars.
Serious question: How do you measure a "generation"?
I can read this word without thinking about The Who song.