noun, plural thousands (as after a numeral) thousand.
a cardinal number, 10 times 100.
a symbol for this number, as 1000 or M.
thousands, the numbers between 1000 and 999,999, as in referring to an amount of money: Property damage was in the thousands.
a great number or amount.
Also, thousand's place.
(in a mixed number) the position of the fourth digit to the left of the decimal point.
(in a whole number) the position of the fourth digit from the right.
amounting to 1000 in number.

before 900; Middle English; Old English thūsend; cognate with Dutch duizend, Old High German dūsunt, Old Norse thūsund, Gothic thūsindi Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thousand (ˈθaʊzənd)
1.  See also number the cardinal number that is the product of 10 and 100
2.  a numeral, 1000, 10³, M, etc, representing this number
3.  (often plural) a very large but unspecified number, amount, or quantity: they are thousands of miles away
4.  (plural) the numbers 2000--9999: the price of the picture was in the thousands
5.  the amount or quantity that is one hundred times greater than ten
6.  something represented by, representing, or consisting of 1000 units
7.  maths the position containing a digit representing that number followed by three zeros: in 4760, 4 is in the thousand's place
8.  a.  amounting to a thousand: a thousand ships
 b.  (as pronoun): a thousand is hardly enough
9.  amounting to 1000 times a particular scientific unit
Related: kilo-, millenary
[Old English thūsend; related to Old Saxon thūsind, Old High German thūsunt, Old Norse thūsund]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. þusend, from P.Gmc. *thusundi (cf. O.Fris. thusend, Du. duizend, O.H.G. dusunt, Ger. tausend, O.N. þusund, Goth. þusundi); related to words in Balto-Slavic (cf. Lith. tukstantis, O.C.S. tysashta, Pol. tysiac, Czech tisic), and probably ultimately a compound with indefinite meaning
"several hundred" or "a great multitude" (with first element perhaps related to Skt. tawas "strong, force"). Used to translate Gk. khilias, L. mille, hence the refinement into the precise modern meaning. There was no general IE word for "thousand." Slang shortening thou first recorded 1867. Thousand island dressing (1916) is presumably named for the region of New York on the St. Lawrence River.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see bat a thousand; by the dozen (thousand); one in a million (thousand); picture is worth a thousand words.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Several thousand of the best job opportunities in the academic world, updated
Two thousand years ago, it was the capital of a powerful trading empire.
Ten thousand years ago hunters and gatherers ate bugs to survive.
The city was burned, the inhabitants killed or exiled, and much of the heritage
  of the past thousand years was lost.
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