This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A group that contains 1,000 elements.

n. One thousand years; a millennium.

n. a group of 1000 things

n. a period of 1000 years; a millennium

n. A thousand; the aggregate of a thousand things; especially, a period of a thousand years.

n. A thousand; the numbers from one multiple of a thousand to the next.

n. Specifically The period of a thousand years.

n. the cardinal number that is the product of 10 and 100

"“The Divine institution of a sabbatical, or seventh year’s solemnity among the Jews, has a plain typical reference to the seventh chiliad, or millenary of the world, according to the well known tradition among the"

large integer   

chiliastic    chiliasm   

millenary   

thousand