chiliasm
Belief in an earthly thousand-year period of peace and prosperity, sometimes equated with the return of Jesus for that period.
It was, however, in the Puritan movement in England, and in similar movements on the continent — especially the Bohemian Brethren — that chiliasm asserted its greatest vitality as an historical force.
Where it comes from
From Ancient Greek χιλιασμός (khiliasmós), from χίλιοι (khílioi, “thousand”).
Adapted from the Wiktionary entry chiliasm (CC BY-SA 4.0).