indispensable

[in-di-spen-suh-buhl]
adjective
1.
absolutely necessary, essential, or requisite: an indispensable member of the staff.
2.
incapable of being disregarded or neglected: an indispensable obligation.
noun
3.
a person or thing that is indispensable.

Origin:
1525–35; < Medieval Latin indispēnsābilis not subject to dispensation. See in-3, dispensable

indispensability, indispensableness, noun
indispensably, adverb


1. needed. See necessary.
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World English Dictionary
indispensable (ˌɪndɪˈspɛnsəbəl)
 
adj
1.  absolutely necessary; essential
2.  not to be disregarded or escaped: an indispensable role
 
n
3.  an indispensable person or thing
 
indispensa'bility
 
n
 
indis'pensableness
 
n
 
indis'pensably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

indispensable
1533, from M.L. indispensabilis, from in- "not" + dispensabilis (see dispense).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Conveniently, for such an indispensable ingredient, limes are available
  year-round.
For they have provided me not only with much indispensable information, but
  with something even more precious-an example.
Each movement is complete in itself, but indispensable.
The indispensable requisite to happiness is a clear conscience.
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