diminution
/ˌdɪmɪˈnjuːʃən/noun
1- a reduction in the size, extent, or importance of something（某物尺寸、程度或重要性的）减少, 减小, 缩减, 降低：
a permanent diminution in value
价格的长期低迷
mass noun the disease shows no signs of diminution.疾病没有减轻的迹象。
1.1
- Music the shortening of the time values of notes in a melodic part【乐】减值, （音值的）缩小。
词源
Middle English: via Old French from Latin deminutio（n-）, from the verb deminuere （see DIMINISH）.