Webster’s Revised Unabridged Dictionary · 1913
Chiliad
Chil′i·ad (kĭl′ĭ·ăd), n. [Gr. χιλιάς, χιλιάδος, fr. χίλιοι a thousand.] A thousand; the aggregate of a thousand things; especially, a period of a thousand years.
The world, then in the seventh chiliad, will be assumed up unto God. Sir. T. More.