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 commander of a thousand troops in Hellenistic Greece

n. The military commander or chief of a thousand men; specifically, an ancient Greek military officer of varying rank; in the modern Greek army, a colonel.

"Now as soldiers are ready for their commander, shod, clothed and armed: but it would be a hard thing, for the chiliarch to go round and shoe or clothe his thousand men; so also nature has formed the animals which are made for service, all ready, prepared, and requiring no further care."