the GNU version of the Collaborative International Dictionary of English
n. The quality, state, or degree of being replaceable.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. exchangeability by virtue of being replaceable
Word Usage
"In general, one's position in an organization, one's salary ranking in that organization and one's value/replaceability in that organization all lead to a delineation of power or powerlessness."