noun, plural millions (as after a numeral) million.
a cardinal number, a thousand times one thousand.
a symbol for this number, as 1,000,000 or M̅.
millions, a number between 1,000,000 and 999,999,999, as in referring to an amount of money: His fortune was in the millions of dollars.
the amount of a thousand thousand units of money, as pounds, dollars, or francs: The three Dutch paintings fetched a million.
a very great number of times: Thanks a million.
the million(s), the mass of the common people; the multitude: poetry for the millions.
amounting to one million in number.
amounting to a very great number: a million things to do.

1350–1400; Middle English milioun < Middle French < early Italian millione, equivalent to mille thousand (< Latin) + -one augmentative suffix

multimillion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
million (ˈmɪljən)
n , pl -lions, -lion
1.  See also number the cardinal number that is the product of 1000 multiplied by 1000
2.  a numeral, 1 000 000, 106, M, etc, representing this number
3.  informal (often plural) an extremely large but unspecified number, quantity, or amount: I have millions of things to do
determiner (preceded by a or by a numeral)
4.  a.  amounting to a million: a million light years away
 b.  (as pronoun): I can see a million under the microscope
5.  informal (Austral) gone a million done for; sunk
Related: mega-
[C17: via Old French from early Italian millione, from mille thousand, from Latin]

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

mid-14c., from O.Fr. million (late 13c.), from It. millione (now milione), lit. "a great thousand," augmentative of mille "thousand," from L. mille. Used mainly by mathematicians until 16c. India, with its love of large numbers, had names before 3c. for numbers well beyond a billion. The ancient Greeks
had no name for a number greater than ten thousand, the Romans for none higher than a hundred thousand. "A million" in Latin would have been decies centena milia, lit. "ten hundred thousand." Million to one as a type of "long odds" is attested from 1761.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Spotted knapweed is driving out native plants and destroying rangeland, costing
  ranchers millions.
Large vultures, vitally necessary and once numbering in the tens of millions,
  now face extinction.
Tim said something about hominids seeing this moon rising over water here for
  millions of years.
The pesticide, which killed insects that spread typhus and malaria, was almost
  certainly instrumental in saving millions of lives.
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