n. The total number of all available workers; the workforce.
n. The power exerted by a single person (analogous to horsepower.)
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the force of workers available
Word Usage
"And what's happened, Larry, is that we have begun to substitute firepower and precision firepower, air delivered, ground delivered, rocket delivered, for what I call manpower and blood."