The quality, state, or characteristic of being bass; the property of having a low pitch or bass-like sound.
From 'bass' combined with the abstract noun suffix -ness, which converts adjectives and nouns into nouns describing their essential quality or state.
The suffix -ness is so productive in English that we can turn almost any word into an abstract quality—'bassness' captures something you can feel but not touch, like how a bass line hits your chest before your ears hear it.
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