noun (n)

• all of the offspring of a given progenitor(noun.group)

  Example:
  We must secure the benefits of freedom for ourselves and our posterity.
  

  Synonym:
  descendants
  

  source: wordnet30
• all future generations(noun.group)

  source: wordnet30
• The race that proceeds from a progenitor; offspring to the furthest generation; the aggregate number of persons who are descended from an ancestor of a generation; descendants; -- contrasted with ancestry; as, the posterity of Abraham.(noun)

  source: webster1913