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indispensable

[in-di-spen-suh-buh l] /ˌɪn dɪˈspɛn sə bəl/
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
1525-1535
1525-35; < Medieval Latin indispēnsābilis not subject to dispensation. See in-3, dispensable
Related forms
indispensability, indispensableness, noun
indispensably, adverb
Synonyms
1. needed. See necessary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for indispensability

indispensable

/ˌɪndɪˈspɛnsəbəl/
adjective
1.
absolutely necessary; essential
2.
not to be disregarded or escaped an indispensable role
noun
3.
an indispensable person or thing
Derived Forms
indispensability, indispensableness, noun
indispensably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for indispensability
indispensable
1533, from M.L. indispensabilis, from in- "not" + dispensabilis (see dispense).
Online Etymology Dictionary, © 2010 Douglas Harper
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