dim.

adverb
  1. 1

    Played in this style

noun
  1. 1

    (grammar) A word form expressing smallness, youth, unimportance, or endearment.

    โ€œBooklet, the diminutive of book, means โ€˜small bookโ€™.โ€

Source: https://en.wiktionary.org/wiki/dim., https://en.wiktionary.org/wiki/diminuendo, https://en.wiktionary.org/wiki/diminutive