The quality or characteristic of being easily set on fire or prone to burning.
From 'combustible' plus the suffix '-ness' (indicating a state or quality). This is an alternative to 'combustibility,' using Germanic English morphology instead of Latinate suffix choices.
While 'combustibility' sounds scientific, 'combustibleness' has an older, almost poetic ring—it's how medieval alchemists might have described gunpowder's dangerous nature before modern chemistry had a name for it.
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