verb (used with object)
to make or cause to seem smaller, less, less important, etc.; lessen; reduce.
Architecture. to give (a column) a form tapering inward from bottom to top.
Music. to make (an interval) smaller by a chromatic half step than the corresponding perfect or minor interval.
to detract from the authority, honor, stature, or reputation of; disparage.
verb (used without object)
to lessen; decrease.

1400–50; late Middle English; blend of diminuen (< Anglo-French diminuer < Medieval Latin dīminuere for Latin dēminuere to make smaller) and minishen minish

diminishable, adjective
diminishment, noun
nondiminishing, adjective
prediminish, verb (used with object)
prediminishment, noun
undiminishable, adjective
undiminishableness, noun
undiminishably, adverb
undiminished, adjective
undiminishing, adjective

5. See decrease.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diminish (dɪˈmɪnɪʃ)
1.  to make or become smaller, fewer, or less
2.  (tr) architect to cause (a column, etc) to taper
3.  (tr) music to decrease (a minor or perfect interval) by a semitone
4.  to belittle or be belittled; reduce in authority, status, etc; depreciate
[C15: blend of diminuen to lessen (from Latin dēminuere to make smaller, from minuere to reduce) + archaic minish to lessen]

diminished (dɪˈmɪnɪʃt)
1.  reduced or lessened; made smaller
2.  music denoting any minor or perfect interval reduced by a semitone
3.  music denoting a triad consisting of the root plus a minor third and a diminished fifth
4.  (postpositive) music (esp in jazz or pop music) denoting a diminished seventh chord having as its root the note specified: B diminished

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

early 15c., from merger of two obsolete verbs, diminue and minish. Diminue is from O.Fr. diminuer "make small," from L. diminuere "break into small pieces," variant of deminuere "lessen, diminish," from de- "completely" + minuere "make small," from root of minus (see
minus). Related: Diminished; diminishes; diminishing. Minish is from O.Fr. menuisier, from L. minuere.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The intrusiveness of other forms of monitoring make us feel somehow diminished.
Economic growth will be constricted, and the quality of life will be diminished.
Downstream human communities also may suffer from diminished water resources.
It releases fewer volatile chemicals, and your tongue's ability to taste
  bitterness is diminished.
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