Pronunciation: (in"di-spen'su-bul), [key]
1. absolutely necessary, essential, or requisite: an indispensable member of the staff.
2. incapable of being disregarded or neglected: an indispensable obligation.
a person or thing that is indispensable.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.