indispensability

from WordNet (r) 3.0 (2006)
indispensability
    n 1: the quality possessed by something that you cannot possibly
         do without [syn: {indispensability}, {indispensableness},
         {vitalness}] [ant: {dispensability}, {dispensableness}]
from The Collaborative International Dictionary of English v.0.48
Indispensability \In`dis*pen`sa*bil"i*ty\, n. [Cf. F.
   indispensabilit['e].]
   Indispensableness.
   [1913 Webster]
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