millenary

nouns

the 1000th anniversary (or the celebration of it)
a span of 1000 years
a sum or aggregate of one thousand (especially one thousand years)
is a type of (narrower)
the cardinal number that is the product of 10 and 100

adjectives

of or relating to the doctrine of the millennium
is derived from
pertains to
relating to or consisting of 1000
is derived from
is derived from
pertains to