required or necessary for a particular purpose, position, etc.; indispensable: the requisite skills of an engineer.
something requisite; a necessary quality, thing, etc.

1425–75; late Middle English < Latin requīsītus past participle of requīrere to seek; see require, -ite2

requisitely, adverb
requisiteness, noun
nonrequisite, adjective, noun
nonrequisitely, adverb
nonrequisiteness, noun
unrequisite, adjective
unrequisitely, adverb
unrequisiteness, noun

1. needed, needful. See necessary. 2. necessity. See requirement.

1. dispensable. 2. luxury. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
requisite (ˈrɛkwɪzɪt)
1.  absolutely essential; indispensable
2.  something indispensable; necessity
[C15: from Latin requisītus sought after, from requīrere to seek for, require]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  requisite
Part of Speech:  adj
Definition:  required, necessary; indispensable
Etymology:  Latin requirere 'to need'
Main Entry:  requisite
Part of Speech:  n
Definition:  something required, necessary, or indispensable
Etymology:  Latin requirere 'to need''s 21st Century Lexicon
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Word Origin & History

1472, from L. requisitus, pp. of requirere (see require). The noun requisition is attested from 1503, from O.Fr. requisition, from L. requisitionem (nom. requisitio) "a searching," from requisitus; the verb is recorded from 1837.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The reason: the current monitoring networks lack the requisite accuracy.
Five years too late, a reply that is completely nonsensical as well as full of
  the requisite bad grammar, and no link.
Collecting the requisite data will be considerably harder and more expensive
  than many of you realize.
Only nuclear power had sufficient bang to propel the requisite payloads into
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