Webster's Revised Unabridged Dictionary · 1913

Thousand

Thousand , noun

[Old English þousend, þusend, Anglo-Saxon þūsend; akin to Old Saxon thūsundig, thūsind, OFries. thusend, Dutch duizend, German tausend, Old High German tūsunt, dūsunt, Icelandic þūsund, þūshund, Swedish tusen, Dan. tusind, Gothic þūsundi, Lithuanian tukstantis, Russ. tuisiacha; of uncertain origin.]

1.
The number of ten hundred; a collection or sum consisting of ten times one hundred units or objects.
2.
Hence, indefinitely, a great number.
A thousand shall fall at thy side, and ten thousand at thy right hand. — Bible (KJV) - Psalm xci. 7

The word thousand often takes a plural form. See the Note under Hundred.

3.
A symbol representing one thousand units; as, 1,000, M or CIC.

Thousand , adjective

1.
Consisting of ten hundred; being ten times one hundred.
2.
Hence, consisting of a great number indefinitely.
Perplexed with a thousand cares. — Shakespeare