power in terms of people available or required for work or military service: the manpower of a country.

1860–65; man1 + power Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
manpower (ˈmænˌpaʊə)
1.  power supplied by men
2.  a unit of power based on the rate at which a man can work; approximately 75 watts
3.  the number of people available or required to perform a particular function: the manpower of a battalion
usage  Gender-neutral form: personnel, staff

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

1862, from man (n.) + power.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We'll have to begin by expending a lot of manpower locating the illegal aliens,
  both in their homes and workplaces.
We've conspired to create an inflation in available manpower with degrees of
  doubtful value in the workplace.
Doing this type of work, however, on such a large scale is a huge undertaking
  requiring a substantial amount of manpower.
Going forward, zoos must actually put funds and manpower into both research and
  saving habitat in the wild all over the world.
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