The quality or state of being flatulent; the characteristic of having or producing excessive intestinal gas or of being pretentious.
From 'flatulent' + '-ness' (a suffix that converts adjectives to nouns representing abstract qualities), similar to 'sadness' or 'kindness'.
This noun form is rare in modern usage—people usually just say 'flatulence' instead, showing how English tidies up its vocabulary by choosing simpler or more common forms!
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