Source : Webster's Revised Unabridged Dictionary (1913)

Millenary \Mil"le*na*ry\, a. [L. millenarius, fr. milleni a
   thousand each, fr. mille a thousand: cf. F. mill['e]naire.
   See {Mile}.]
   Consisting of a thousand; millennial.

Millenary \Mil"le*na*ry\, n.
   The space of a thousand years; a millennium; also, a
   {Millenarian}.``During that millenary.'' --Hare.

Source : WordNet®

millenary
     adj 1: of or relating to the doctrine of the millennium
     2: relating to or consisting of 1000