prerequisite

[pri-rek-wuh-zit, pree-]
adjective
1.
required beforehand: a prerequisite fund of knowledge.
noun
2.
something prerequisite: A visa is still a prerequisite for travel in many countries.

Origin:
1625–35; pre- + requisite

perquisite, prerequisite.


2. requirement, requisite, essential, precondition.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prerequisite (priːˈrɛkwɪzɪt)
 
adj
1.  required as a prior condition
 
n
2.  something required as a prior condition

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

prerequisite
1633 (n.), 1651 (adj.), "required beforehand," from pre- + requisite (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
This class is not a prerequisite to anything.
About 50 percent of special agents have previous law enforcement experience,
  but it's not a prerequisite.
The value 3.2 for pi was a prerequisite for making that formula plausible.
Writing enables the transmission of ideas over vast distances of time and space
  and is a prerequisite of complex civilization.
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