The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Millenary \Mil"le*na*ry\, n.
   The space of a thousand years; a millennium; also, a
   Millenarian."During that millenary." --Hare.
   [1913 Webster]

WordNet (r) 3.0 (2006):

millenary
    adj 1: of or relating to the doctrine of the millennium
    2: relating to or consisting of 1000
    n 1: the 1000th anniversary (or the celebration of it) [syn:
         millennium, millenary]
    2: a span of 1000 years [syn: millennium, millenary]
    3: a sum or aggregate of one thousand (especially one thousand
       years)