reformer

[ri-fawr-mer]
noun
1.
a person devoted to bringing about reform, as in politics or society.
2.
(initial capital letter) any of the leaders of the Reformation.

Origin:
1520–30; reform + -er1

antireformer, noun
counterreformer, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reform (rɪˈfɔːm)
 
vb
1.  (tr) to improve (an existing institution, law, practice, etc) by alteration or correction of abuses
2.  to give up or cause to give up a reprehensible habit or immoral way of life
3.  chem to change the molecular structure of (a hydrocarbon) to make it suitable for use as petrol by heat, pressure, and the action of catalysts
 
n
4.  an improvement or change for the better, esp as a result of correction of legal or political abuses or malpractices
5.  a principle, campaign, or measure aimed at achieving such change
6.  improvement of morals or behaviour, esp by giving up some vice
 
[C14: via Old French from Latin reformāre to form again]
 
re'formable
 
adj
 
re'formative
 
adj
 
re'former
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He was a reformer of charity methods, as of bad political methods in his own
  fold.
Therefore, this project will develop a multi-mode reformer to maximize both
  operational flexibility and overall system efficiency.
Under this scenario, the reformer is operated when hydrogen is needed for the
  fuel cell and/or vehicle refueling.
Each reformer was followed by a hydrogen separation module.
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