[dim-uh-noo-shuhn, -nyoo-]
the act, fact, or process of diminishing; lessening; reduction.
Music. the repetition or imitation of a subject or theme in notes of shorter duration than those first used.

1275–1325; Middle English diminucion < Anglo-French diminuciun < Latin dīminūtiōn- (stem of dīminūtiō), for dēminūtiōn- (stem of dēminūtiō) (by influence of dīmunuere; see diminish), equivalent to dēminūt(us) (past participle of dēminuere, equivalent to dē- de- + minuere to lessen) + -iōn- -ion

prediminution, noun
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World English Dictionary
diminution (ˌdɪmɪˈnjuːʃən)
1.  reduction; decrease
2.  music Compare augmentation the presentation of the subject of a fugue, etc, in which the note values are reduced in length
[C14: from Latin dēminūtiō; see diminish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300, from Anglo-Fr. from diminuciun, Fr. diminution, from L. diminutionem, earlier deminutionem, noun of action from deminuere (see diminish).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Among the effects observed were a reduction in teasing and a diminution of
  destructiveness toward property.
Several questions have been raised about the progressive diminution of the
  birth rate.
Then there is the real or perceived diminution of mobility on the job market.
The diminution of the national cricket team is a catastrophe in its own right.
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