the correction of something bad or defective.

1810–20; < Latin remediā-t(us), past participle of remediāre to remedy + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
remediation (rɪˌmiːdɪˈeɪʃən)
the action of remedying something, esp the reversal or stopping of damage to the environment

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

1818, noun of action from remedy (q.v.). In educational jargon from c.1975.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Improving outcomes for students who require remediation.
The school district decided it would be cheaper to provide bottled water than
  testing and remediation efforts.
It has also identified weakness in monitoring and inadequate evidence to
  support some remediation technologies now in place.
Siemens was still working on patches but had found a remediation for one of the
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