Definitions of generation:

• noun:   the act of producing offspring or multiplying by such production
• noun:   the production of heat or electricity

  Example: "Dams were built for the generation of electricity"

• noun:   group of genetically related organisms constituting a single step in the line of descent
• noun:   the normal time between successive generations

  Example: "They had to wait a generation for that prejudice to fade"

• noun:   a stage of technological development or innovation

  Example: "The third generation of computers"

• noun:   a coming into being
• noun:   all the people living at the same time or of approximately the same age