Usefulness
The Century Dictionary and Cyclopedia
noun.
The state or character of being useful; conduciveness to some end; utility; serviceableness; advantage.
the GNU version of the Collaborative International Dictionary of English
noun.
The quality or state of being useful; utility; serviceableness; advantage.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
the quality of being useful, to which
extent
something is
useful
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the quality of being of practical use
Word Usage
"Well enjoy the perks while you can because Palin will throw you under the tractor trailer wheels as soon as your usefulness is all used up."