diminution
noun [ C or U ] formal uk/ˌdɪm.ɪˈnjuː.ʃən/ us/ˌdɪm.əˈnuː.ʃən/
减少；降低
reduction in size or importance
Regular exercise can result in a general diminution in stress levels. 经常锻炼可以全面缓解精神压力。
The company suffered a diminution in profits. 该公司处于利润萎缩的境况。