Etymology
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lessen (v.)

"to become less," c. 1300, from less (adj.) + -en (1). Transitive sense "to make less" is from c. 1400. Related: Lessened; lessening.

updated on June 12, 2016

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Definitions of lessen from WordNet

lessen (v.)
decrease in size, extent, or range;
Synonyms: decrease / diminish / fall
lessen (v.)
make smaller;
Synonyms: decrease / minify
lessen (v.)
wear off or die down;
Synonyms: subside
From wordnet.princeton.edu, not affiliated with etymonline.