The quality or state of being bulky; the amount of space something takes up relative to its weight.
From 'bulky' plus the noun-forming suffix '-ness', which converts adjectives into abstract nouns describing qualities or conditions. Traces back to 'bulk' from Middle Dutch.
The suffix '-ness' is English's most productive way to turn feelings and qualities into nouns—there are thousands of words ending in it, from 'happiness' to 'bulkiness.' It's so common that we can almost create new ones on the fly!
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