verb (used without object)
to become less.
verb (used with object)
to make less; reduce.
Archaic. to represent as less; depreciate; disparage.

1300–50; late Middle English lessenen, lasnen (see less, -en1); replacing Middle English lessen

unlessened, adjective

lessen, lesson.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lessen (ˈlɛsən)
1.  to make or become less
2.  (tr) to make little of

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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Word Origin & History

"to become less," c.1300, from less (q.v.). Related: Lessened; lessening.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It should lessen the impact of the tax on new construction and result in
  refunds for developers who already have made payments.
The wake of the affair will be a long one and no doubt in time its effects will
Higher pay would lessen the temptations of corruption.
The team relied on special systems to lessen the risks of such extreme diving.
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