The meaning of Generation in the Bible
(From Easton's Bible Dictionary)

Genesis 2:4, "These are the generations," means the "history." 5:1, "The book of the generations," means a family register, or history of Adam 37:2, "The generations of Jacob" = the history of Jacob and his descendants 7:1, "In this generation" = in this age. Psalms 49:19, "The generation of his fathers" = the dwelling of his fathers, i.e., the grave. Psalms 73:15, "The generation of thy children" = the contemporary race. Isaiah 53:8, "Who shall declare his generation?" = His manner of life who shall declare? or rather = His race, posterity, shall be so numerous that no one shall be able to declare it.

See more on the meaning of Generation in the Bible:
Generation {International Standard Bible Encyclopedia}

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