pos·ter·i·ty /päˈsterədē/ noun all future generations of people. "the victims' names are recorded for posterity" synonyms: future generations, succeeding generations, those who come after us; the future "the names of those who died are recorded for posterity on a framed scroll" ARCHAIC the descendants of a person. "God offered Abraham a posterity like the stars of heaven" synonyms: descendants, heirs, successors, offspring, children, family, progeny, scions