What is the meaning of generation?

noun

• All the people living at the same time or of approximately the same age.
  • synonyms: coevals, contemporaries
• Group of genetically related organisms constituting a single step in the line of descent.
• The normal time between successive generations.
  • usage: "they had to wait a generation for that prejudice to fade"
• A stage of technological development or innovation.
  • usage: "the third generation of computers"
• A coming into being.
  • synonyms: genesis
• The production of heat or electricity.
  • usage: "dams were built for the generation of electricity"
• The act of producing offspring or multiplying by such production.
  • synonyms: multiplication, propagation