diminution meaning
EN
[dɪmɪˈnjuːʃ(ə)n] WDiminution
- In Western music and music theory, diminution (from Medieval Latin diminutio, alteration of Latin deminutio, decrease) has four distinct meanings.
FR diminution 
- NounPLdiminutionsSUF-tion
Definition of diminution in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Countable nouns
- Nouns
- fr diminution
- fr diminutions
- en diminutions
Source: Wiktionary
Grammatically, this word "diminution" is a noun, more specifically, a countable noun.