noun
1.
a. : power available from or supplied by the physical effort of man
b. : a unit of power assumed to be the rate at which a man can perform mechanical work ; sometimes : one tenth of a horsepower
2. usually manpower ˈ ̷ ̷ˌ ̷ ̷ : the strength (as of a nation, community, or industry) expressed in terms of available persons : personnel available or competent to serve : human resources
requires a tremendous amount of engineering manpower — Controller
the largest single supplier of educated manpower — T.D.Durrance
manpower problems
specifically : the strength of a nation in terms of persons available for military service