verb (used with object)
to exceed in number.

1660–70; out- + number

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World English Dictionary
outnumber (ˌaʊtˈnʌmbə)
(tr) to exceed in number

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"to number more than," 1670, from out + number (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For example, in these estuaries, snails that are infected with trematodes
  outnumber those that are fluke-free.
Writer notes that the number of overweight people in the world outnumber the
  number who are hungry.
It includes trillions of genes that outnumber those of their hosts by hundreds
  of times.
By one estimate, parasites may outnumber free-living species four to one.
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