American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
His nine-book history of the Persian wars is gossipy, discursive, outrageous, frequently inaccurate and always brilliantly entertaining.— Culture | guardian.co.uk
To truly understand these as either a commercial object or a discursive object, it would be necessary to understand the primary intention of the designer, which cannot always be read from the objects-especially in hybrids.
If you just want to talk about "discursive" design because that is what you are writing a book about, then just do it.

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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