The quality or state of being very small or tiny in size.
From diminutive (Latin diminutivus, from diminuere 'to lessen') + -ness suffix. The suffix -ness turns adjectives into nouns describing their quality or state.
Diminutiveness appears rarely in English because we usually just say 'smallness,' but it's the technically precise term for the specific quality of being miniature—languages often create elaborate words for concepts they care deeply about.
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