indispensable: Meaning and Definition of

in•dis•pen•sa•ble

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