[1] : The Collaborative International Dictionary of English v.0.48

thousand \thou"sand\, n. oe. thornousend, thornusend, as.
   thorn=usend; akin to os. th=usundig, th=usind,
   ofries. thusend, d. duizend, g. tausend, ohg. t=usunt,
   d=usunt, icel. thorn=usund, thorn=ushund, sw.
   tusen, dan. tusind, goth. thorn=usundi, lith. 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.
      1913 webster

   2. hence, indefinitely, a great number.
      1913 webster

            a thousand shall fall at thy side, and ten thousand
            at thy right hand.                    --ps. xci. 7.
      1913 webster

   note: the word thousand often takes a plural form. see the
         note under hundred.
         1913 webster

   3. a symbol representing one thousand units; as, 1,000, m or
      cicrev.
      1913 webster
see also:
hundred 

[2] : The Collaborative International Dictionary of English v.0.48

thousand \thou"sand\, a.
   1. consisting of ten hundred; being ten times one hundred.
      1913 webster

   2. hence, consisting of a great number indefinitely.
      "perplexed with a thousand cares." --shak.
      1913 webster

[3] : WordNet (r) 2.0

thousand
     adj : denoting a quantity consisting of 1,000 items or units syn:
            a thousand, one thousand, 1000, m, k
     n : the cardinal number that is the product of 10 and 100 syn:
         one thousand, 1000, m, k, chiliad, g, grand,
          thou, yard
see also:
a thousand one thousand 1000 m k m 
k chiliad g grand thou 
yard 

[4] : Moby Thesaurus II by Grady Ward, 1.0

58 moby thesaurus words for "thousand":
   g, m, a billion, a crore, a lakh, a million, a myriad, a nonillion,
   a quadrillion, a thousand, a zillion, billion, chiliad, chiliagon,
   chiliahedron, chiliarch, chiliarchia, considerable, ever so many,
   full many, gobs, grand, heap, heaped-up, jillion, kilo, kilocycle,
   kilogram, kilohertz, kiloliter, kilometer, lakh, loads, many,
   millennium, millepede, milligram, milliliter, million,
   multifarious, multifold, multiple, multitudinal, multitudinous,
   myriad, no few, not a few, numerous, one hundred thousand, oodles,
   quantities, quite some, ten thousand, thou, trillion, very many,
   yard, zillion

Thousand >> T Words
Thousand, definition of term: Thousand
thousand_pag1.html

Thousand Oaks >> T Words
Thousand Oaks, definition of term: Thousand Oaks
thousand+oaks_pag1.html

Ten Thousand >> T Words
Ten Thousand, definition of term: Ten Thousand
ten+thousand_pag1.html