postmillennialism
Concise Oxford English Dictionary © 2008 Oxford University Press:
postmillennialism/pəʊs(t)mɪˈlɛnɪəlɪz(ə)m/
▶noun (among fundamentalist Christians) the doctrine that the Second Coming of Christ will be the culmination of the prophesied millennium of blessedness.
– derivatives
postmillennialist noun.
postmillennialist noun.
'postmillennialism' also found in these Oxford entries:

