All 7 Uses

paradox
in
The Sword of Summer
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Gleipnir was just as thin and light, but its paradox ingredients gave it great strength.†
p. 321.6
Paradox ingredients?†
p. 321.6
Paradox ingredients are very difficult to craft with, very dangerous.†
p. 321.7
"Dunno if that last one is a paradox," I said.†
p. 321.8
It is woven with the most powerful paradoxes in the Nine Worlds—Wi-Fi with no lag, a politician's sincerity, a printer that prints, healthy deep-fried food, and an interesting grammar lecture!†
p. 321.9

paradoxes = situations or statements that may be true but are surprising or seem impossible because parts of them seem to contradict each other
An old dwarf once told me that the most powerful crafting materials are paradoxes.†
p. 457.1
But I've got one more—the final paradox that will bind you: the Sword of Summer, a weapon that wasn't designed to be a weapon, a blade that is best used by letting go of it.†
p. 457.1 *

Definitions:

(1) (paradox)
a situation or statement that seems to contradict itself but may still be true
(2) (meaning too rare to warrant focus)
More rarely, paradox may refer to a statement that contradicts itself -- such as "I always lie."